m (Text replace - "(b) " to "'''(b)''' ")
m (Text replace - "(c) " to "'''(c)''' ")
Line 17: Line 17:
 
'''(b)''' are you?
 
'''(b)''' are you?
  
(c) are
+
'''(c)''' are
  
 
(d) No output
 
(d) No output
Line 37: Line 37:
 
'''(b)''' printf("%d",***((a+5)+2)+1);
 
'''(b)''' printf("%d",***((a+5)+2)+1);
  
(c) printf("%d",*(*(*(a+5)+2)+1));
+
'''(c)''' printf("%d",*(*(*(a+5)+2)+1));
  
 
(d) None of these
 
(d) None of these
Line 57: Line 57:
 
'''(b)''' 30
 
'''(b)''' 30
  
(c) 36
+
'''(c)''' 36
  
 
(d) Undefined Behavior
 
(d) Undefined Behavior
Line 88: Line 88:
 
'''(b)''' 4
 
'''(b)''' 4
  
(c) 3
+
'''(c)''' 3
  
 
(d) None of these
 
(d) None of these
Line 110: Line 110:
 
'''(b)''' 2 5
 
'''(b)''' 2 5
  
(c) 7 7
+
'''(c)''' 7 7
  
 
(d) 7 2
 
(d) 7 2
Line 133: Line 133:
 
'''(b)''' 2 3 4 5
 
'''(b)''' 2 3 4 5
  
(c) 4 5 0 0
+
'''(c)''' 4 5 0 0
  
 
(d) none of the above
 
(d) none of the above
Line 161: Line 161:
 
'''(b)''' cd
 
'''(b)''' cd
  
(c) ef
+
'''(c)''' ef
  
 
(d) gh
 
(d) gh
Line 198: Line 198:
 
'''(b)''' 5
 
'''(b)''' 5
  
(c) 7
+
'''(c)''' 7
  
 
(d) 15
 
(d) 15
Line 228: Line 228:
 
'''(b)''' 15
 
'''(b)''' 15
  
(c) 6
+
'''(c)''' 6
  
 
(d) 7
 
(d) 7
Line 251: Line 251:
 
'''(b)''' 10
 
'''(b)''' 10
  
(c) Compile Error
+
'''(c)''' Compile Error
  
 
(d) Garbage value
 
(d) Garbage value
Line 273: Line 273:
 
'''(b)''' 13
 
'''(b)''' 13
  
(c) 17
+
'''(c)''' 17
  
 
(d) None of above
 
(d) None of above
Line 294: Line 294:
 
'''(b)''' +INF
 
'''(b)''' +INF
  
(c) -121
+
'''(c)''' -121
  
 
(d) -8
 
(d) -8
Line 321: Line 321:
 
'''(b)''' Greater  
 
'''(b)''' Greater  
  
(c) Lesser  
+
'''(c)''' Lesser  
  
 
(d) Compile Error
 
(d) Compile Error
Line 354: Line 354:
 
'''(b)''' f1 and f3
 
'''(b)''' f1 and f3
  
(c) f1 and f2
+
'''(c)''' f1 and f2
  
 
(d) f1, f2, and f3
 
(d) f1, f2, and f3
Line 376: Line 376:
 
'''(b)''' i=3 j=4
 
'''(b)''' i=3 j=4
  
(c) i=5 j=4
+
'''(c)''' i=5 j=4
  
 
(d) the behavior is undefined
 
(d) the behavior is undefined
Line 419: Line 419:
 
'''(b)''' 3 5 3 5
 
'''(b)''' 3 5 3 5
  
(c) 5 3 3 5
+
'''(c)''' 5 3 3 5
  
 
(d) none of the above
 
(d) none of the above
Line 451: Line 451:
 
'''(b)''' 0 1 2 1
 
'''(b)''' 0 1 2 1
  
(c) 1 2 0 1
+
'''(c)''' 1 2 0 1
  
 
(d) 0 2 1 1
 
(d) 0 2 1 1
Line 468: Line 468:
 
'''(b)''' pointer to int
 
'''(b)''' pointer to int
  
(c) pointer to function taking two pointer-to-float arguments and returning int
+
'''(c)''' pointer to function taking two pointer-to-float arguments and returning int
  
 
(d) none of the above
 
(d) none of the above
Line 491: Line 491:
 
'''(b)''' 6
 
'''(b)''' 6
  
(c) 9
+
'''(c)''' 9
  
 
(d) none of the above
 
(d) none of the above
Line 518: Line 518:
 
'''(b)''' 5
 
'''(b)''' 5
  
(c) 6
+
'''(c)''' 6
  
 
(d) 7
 
(d) 7
Line 539: Line 539:
 
'''(b)''' 2 1
 
'''(b)''' 2 1
  
(c) 2 5
+
'''(c)''' 2 5
  
 
(d) none of the above
 
(d) none of the above
Line 568: Line 568:
 
'''(b)''' 9
 
'''(b)''' 9
  
(c) 7
+
'''(c)''' 7
  
 
(d) none of the above
 
(d) none of the above
Line 592: Line 592:
 
'''(b)''' x×n
 
'''(b)''' x×n
  
(c) nx
+
'''(c)''' nx
  
 
(d) none of the above
 
(d) none of the above
Line 623: Line 623:
 
'''(b)''' 4
 
'''(b)''' 4
  
(c) 3
+
'''(c)''' 3
  
 
(d) 0
 
(d) 0
Line 646: Line 646:
 
'''(b)''' World
 
'''(b)''' World
  
(c) Hello World
+
'''(c)''' Hello World
  
 
(d) Compile Error
 
(d) Compile Error
Line 670: Line 670:
 
'''(b)''' Not Equal
 
'''(b)''' Not Equal
  
(c) Compiler Dependent
+
'''(c)''' Compiler Dependent
  
 
(d) Compile Error
 
(d) Compile Error
Line 702: Line 702:
 
'''(b)''' Ifmmp
 
'''(b)''' Ifmmp
  
(c) Compile Error
+
'''(c)''' Compile Error
  
 
(d) Segmentation fault
 
(d) Segmentation fault
Line 726: Line 726:
 
'''(b)''' Compile Error  
 
'''(b)''' Compile Error  
  
(c) 12
+
'''(c)''' 12
  
 
(d) 0
 
(d) 0
Line 756: Line 756:
 
'''(b)''' 1 1
 
'''(b)''' 1 1
  
(c) 10 11
+
'''(c)''' 10 11
  
 
(d) 10 10
 
(d) 10 10
Line 777: Line 777:
 
'''(b)''' Link error
 
'''(b)''' Link error
  
(c) Segmentation fault
+
'''(c)''' Segmentation fault
  
 
(d) Compiler error
 
(d) Compiler error

Revision as of 07:23, 16 November 2013

1. What is the output of this program? <syntaxhighlight lang="c">

  1. include<stdio.h>

int main() {

   char *ptr;
   char string[] = "How are you?";
   ptr = string;
   ptr += 4;
   printf("%s",ptr);
   
   return 0;

} </syntaxhighlight> (a) How are you?

(b) are you?

(c) are

(d) No output


2. Which of the following will print the value 2 for the above code? <syntaxhighlight lang="c">

  1. include<stdio.h>

int main() {

   int a[10][20][30] = {0};
   a[5][2][1] = 2;
   return 0;

} </syntaxhighlight> (a) printf("%d",*(((a+5)+2)+1));

(b) printf("%d",***((a+5)+2)+1);

(c) printf("%d",*(*(*(a+5)+2)+1));

(d) None of these


3. What is the output of the following program? <syntaxhighlight lang="c">

  1. include<stdio.h>

int main() {

   int a = 5;
   int b = ++a * a++;
   printf("%d ",b);
   return 0;

} </syntaxhighlight> (a)25

(b) 30

(c) 36

(d) Undefined Behavior


4. What is the output of the following program? <syntaxhighlight lang="c">

  1. include<stdio.h>

int main() {

   int a = 5;
   switch(a)
   {
       default:
       a = 4;
       case 6:
           a--;
       case 5:
           a = a+1;
       case 1:
           a = a-1;
   }
   printf("%d \n",a);
   return 0;

} </syntaxhighlight> (a)5

(b) 4

(c) 3

(d) None of these


5. What is the output of the following program? <syntaxhighlight lang="c">

  1. include<stdio.h>

int main() {

   int a = 2,b = 5;
   a = a^b;
   b = b^a;
   printf("%d %d",a,b);
   return 0;

} </syntaxhighlight> (a)5 2

(b) 2 5

(c) 7 7

(d) 7 2


6. What is the output of the following program? <syntaxhighlight lang="c">

  1. include <stdio.h>

int main() {

   int a[][3] = {1, 2, 3, 4, 5, 6};
   int (*ptr)[3] = a;
   printf("%d %d ", (*ptr)[1], (*ptr)[2]);
   ++ptr;
   printf("%d %d\n", (*ptr)[1], (*ptr)[2]);
   return 0;

} </syntaxhighlight> (a)2 3 5 6

(b) 2 3 4 5

(c) 4 5 0 0

(d) none of the above


7. What is the output of the following program? <syntaxhighlight lang="c">

  1. include <stdio.h>

void f(char**);

int main() {

   char *argv[] = { "ab", "cd", "ef", "gh", "ij", "kl" };
   f(argv);
   return 0;

} void f(char **p) {

   char *t;
   t = (p += sizeof(int))[-1];
   printf("%s\n", t);

} </syntaxhighlight> (a)ab

(b) cd

(c) ef

(d) gh


8. What is the output of the following program? <syntaxhighlight lang="c">

  1. include <stdarg.h>
  2. include <stdio.h>

int ripple(int n, ...) {

   int i, j, k;
   va_list p;
   k = 0;
   j = 1;
   va_start(p, n);
   for (; j < n; ++j)
   {
       i = va_arg(p, int);
       k += i;
   }
   va_end(p);
   
   return k;

} int main() {

   printf("%d\n", ripple(3, 5, 7));
   return 0;

} </syntaxhighlight> (a)12

(b) 5

(c) 7

(d) 15


9. What is the output of the following program? <syntaxhighlight lang="c">

  1. include <stdio.h>

int counter(int i) {

   static int count = 0;
   count = count + i;
   
   return count;

}

int main() {

   int i, j;
   for (i = 0; i <= 5; i++)
       j = counter(i);
   printf("%d\n", j);
   return 0;

} </syntaxhighlight> (a)10

(b) 15

(c) 6

(d) 7


10. What is the output of the following program? <syntaxhighlight lang="c">

  1. include<stdio.h>

int main() {

   const int x = 5;
   const int *ptrx;
   ptrx = &x;
   *ptrx = 10;
   printf("%d\n", x);
   return 0;

} </syntaxhighlight> (a)5

(b) 10

(c) Compile Error

(d) Garbage value


11. What is the output of the following program? <syntaxhighlight lang="c">

  1. include<stdio.h>
  2. define x 4+1

int main() {

   int i;
   i = x*x*x;
   printf("%d",i);
   return 0;

} </syntaxhighlight> (a)125

(b) 13

(c) 17

(d) None of above


12. What is the output of the following program? <syntaxhighlight lang="c">

  1. include<stdio.h>

int main() {

   char c=125;
   c=c+10;
   printf("%d",c);
   return 0;

} </syntaxhighlight> (a)135

(b) +INF

(c) -121

(d) -8


13. What is the output of the following program? <syntaxhighlight lang="c">

  1. include<stdio.h>

int main() {

   int i=10;
   static int x=i;
   if(x==i)
       printf("Equal");
   else if(x>i)
       printf("Greater");
   else
       printf("Lesser");
   return 0;

} </syntaxhighlight> (a)Equal

(b) Greater

(c) Lesser

(d) Compile Error


14. Consider the following code segment: <syntaxhighlight lang="c">

  1. include <stdlib.h>

int *f1() {

   int x = 10;
   return &x;

} int *f2() {

   int *ptr;
   *ptr = 10;
   return ptr;

} int *f3() {

   int *ptr;
   ptr = (int*) malloc(sizeof (*ptr));
   return ptr;

} </syntaxhighlight> Which of these functions uses pointers incorrectly?

(a)f3 only

(b) f1 and f3

(c) f1 and f2

(d) f1, f2, and f3


15. What is the output of the following program? <syntaxhighlight lang="c">

  1. include <stdio.h>

int main() {

   int i = 3;
   int j;
   j = sizeof(++i + ++i);
   printf("i=%d j=%d\n", i, j);
   return 0;

} </syntaxhighlight> (a)i=4 j=4

(b) i=3 j=4

(c) i=5 j=4

(d) the behavior is undefined


16. What is the output of the following program? <syntaxhighlight lang="c">

  1. include <stdio.h>

void f1(int*, int); void f2(int*, int); void (*p[2])(int*, int);

int main() {

   int a = 3;
   int b = 5;
   p[0] = f1;
   p[1] = f2;
   p[0](&a, b);
   printf("%d %d ", a, b);
   p[1](&a, b);
   printf("%d %d\n", a, b);
   return 0;

}

void f1(int *p, int q) {

   int tmp = *p;
   *p = q;
   q = tmp;

} void f2(int *p, int q) {

   int tmp = *p;
   *p = q;
   q = tmp;

} </syntaxhighlight> (a)5 5 5 5

(b) 3 5 3 5

(c) 5 3 3 5

(d) none of the above


17. What is the output of the following program? <syntaxhighlight lang="c">

  1. include <stdio.h>

void e(int);

int main() {

   int a = 3; 
   e(a);
   putchar('\n');
   return 0;

} void e(int n) {

   if (n > 0)
   {
       e(--n);
       printf("%d ", n);
       e(--n);
   }

} </syntaxhighlight> (a)0 1 2 0

(b) 0 1 2 1

(c) 1 2 0 1

(d) 0 2 1 1


18. Consider the following code segment: <syntaxhighlight lang="c"> typedef int (*test)(float*, float*); test tmp; </syntaxhighlight> What is the type of tmp?


(a)function taking two pointer-to-float arguments and returning pointer to int

(b) pointer to int

(c) pointer to function taking two pointer-to-float arguments and returning int

(d) none of the above


19. What is the output of the following program? <syntaxhighlight lang="c">

  1. include <stdio.h>

int main() {

   char p;
   char buf[10] = {1, 2, 3, 4, 5, 6, 9, 8};
   p = (buf + 1)[5];
   printf("%d\n", p);
   return 0;

} </syntaxhighlight> (a)5

(b) 6

(c) 9

(d) none of the above


20. What is the output of the following program? <syntaxhighlight lang="c">

  1. include <stdio.h>

int main() {

   struct node
   {
       int a;
       int b;
       int c;
   };
   struct node s = { 3, 5, 6 };
   struct node *pt = &s;
   printf("%d\n", *((int*)pt+1));
   return 0;

} </syntaxhighlight> (a)3

(b) 5

(c) 6

(d) 7


21. What is the output of the following program? <syntaxhighlight lang="c">

  1. include <stdio.h>

int main(void) {

   char a[5] = { 1, 2, 3, 4, 5 };
   char *ptr = (char*)(&a + 1);
   printf("%d %d\n", *(a + 1), *(ptr - 1));
   return 0;

} </syntaxhighlight> (a)Compile Error

(b) 2 1

(c) 2 5

(d) none of the above


22. What is the output of the following program? <syntaxhighlight lang="c">

  1. include <stdio.h>

void foo(int[][3]);

int main(void) {

   int a[3][3] = { {1, 2, 3}, {4, 5, 6}, {7, 8, 9} };
   foo(a);
   printf("%d\n", a[2][1]);
   return 0;

}

void foo(int b[][3]) {

   ++b;
   b[1][1] = 9;

} </syntaxhighlight> (a)8

(b) 9

(c) 7

(d) none of the above


23. Consider the following function: <syntaxhighlight lang="c"> int foo(int x, int n) {

   int val = 1;
   if (n > 0)
   {
       if (n % 2 == 1)
       val *= x;
       val *= foo(x * x, n / 2);
   }
   return val;

} </syntaxhighlight> What function of x and n is computed by foo? (a)x^n

(b) x×n

(c) nx

(d) none of the above

24. What is the output of the following program? <syntaxhighlight lang="c">

  1. include<stdio.h>

int main() {

   int a = 0;
   switch(a)
   {
       default:
           a = 4;
       case 6:
           a--;
       case 5:
           a = a+1;
       case 1:
           a = a-1;
   }
   printf("%d \n",a);
   return 0;

} </syntaxhighlight> (a)5

(b) 4

(c) 3

(d) 0


25. What is the output of the following program? <syntaxhighlight lang="c">

  1. include<stdio.h>

int main() {

   int a = 2;
   if(a == (1,2))
       printf("Hello");
   if(a == 1,2)
       printf("World");
   return 0;

} </syntaxhighlight> (a)Hello

(b) World

(c) Hello World

(d) Compile Error


26. What is the output of the following program? <syntaxhighlight lang="c">

  1. include<stdio.h>

int main() {

   int a = 1,2;
   int b = (1,2);
   if(a == b)
       printf("Equal");
   else
       printf("Not Equal");
   return 0;

} </syntaxhighlight> (a)Equal

(b) Not Equal

(c) Compiler Dependent

(d) Compile Error


27. What is the output of the following program? <syntaxhighlight lang="c">

  1. include<stdio.h>

void foo(char *);

int main() {

   char *string = "Hello";
   foo(string);
   printf("%s",string);
   return 0;

}

void foo(char *a) {

   while(*a)
   {
       *a += 1;
       a++;
   }

} </syntaxhighlight> (a)Hello

(b) Ifmmp

(c) Compile Error

(d) Segmentation fault


28. What is the output of the following program? <syntaxhighlight lang="c">

  1. include<stdio.h>
  2. include<stdlib.h>

int main() {

   char s[] = "Opendays2012";
   int i = 0;
   while(*(s++))
       i++;
   printf("%d",i);
   return 0;

} </syntaxhighlight> (a)Segmentation Fault

(b) Compile Error

(c) 12

(d) 0


29. What is the output of the following program? <syntaxhighlight lang="c">

  1. include<stdio.h>

int a = 10; int main() {

   fun();
   fun();
   return 0;

}

int fun() {

   static int a = 1;
   printf("%d ",a);
   a++;
   return 0;

} </syntaxhighlight> (a)1 2

(b) 1 1

(c) 10 11

(d) 10 10


30. What is the output of the following program? <syntaxhighlight lang="c">

  1. include <stdio.h>
  2. define crypt(s,t,u,m,p,e,d) m##s##u##t
  3. define begin crypt(a,n,i,m,a,t,e)

int begin() {

   printf("Hello\n");
   return 0;

} </syntaxhighlight> (a)Hello

(b) Link error

(c) Segmentation fault

(d) Compiler error


31. Consider the following program: <syntaxhighlight lang="c">

  1. include<stdio.h>

int main() {

   int a[10][20][30]={0};
   printf("%ld",&a+1 - &a);
   return 0;

} </syntaxhighlight> What is the output of this program? Ans:


32. Consider the following program: <syntaxhighlight lang="c">

  1. include<stdio.h>

int main() {

   int a[10][20][30] = {0};
   int *b = a;
   int *c = a+1;
   printf("%ld", c-b);
   return 0;

} </syntaxhighlight> What is the output of this program? (You may ignore compiler warnings)

Ans:


33. Consider the following program: <syntaxhighlight lang="c">

  1. include<stdio.h>
  2. include<stdlib.h>

int* fun();

int main() {

   int *a = fun();
   printf("%d",*a);
   return 0;

} int* fun() {

   int *a =(int*) malloc(sizeof(int));
   *a = 10;
   return a;

} </syntaxhighlight> What is the output of this program? Ans:


34. Consider the following program: <syntaxhighlight lang="c">

  1. include<stdio.h>

int main() {

   int *a = fun();
   printf("%d",*a);
   return 0;

} int fun() {

   int a = 10;
   return a;

} </syntaxhighlight> What is the output of this program? Ans:


35. Consider the following program: <syntaxhighlight lang="c">

  1. include<stdio.h>
  2. include<string.h>

int main() {

   char string[] = "Hello";
   printf("%lu %lu",sizeof(string),strlen(string));
   return 0;

} </syntaxhighlight> What is the output of this program? Ans:


36. Consider the following program: <syntaxhighlight lang="c">

  1. include<stdio.h>

int main() {

   float a = 0.5;
   if(a == 0.5)
       printf("Yes");
   else
       printf("No");
   return 0;

} </syntaxhighlight> What is the output of this program? Ans:


37. Consider the following program: <syntaxhighlight lang="c">

  1. include<stdio.h>
  2. include<string.h>

void foo(char *);

int main() {

   char a[100] = {0};
   printf("%lu %lu",sizeof(a),strlen(a));
   return 0;

} </syntaxhighlight> What is the output of this program? Ans:



38. Consider the following program: <syntaxhighlight lang="c">

  1. include<stdio.h>

int main() {

   int a;
   printf("%d",scanf("%d",&a));
   return 0;

} </syntaxhighlight> What is the output of the above code?

Ans:

39. If the binary equivalent of 5.375 in normalised form is 0100 0000 1010 1100 0000 0000 0000 0000, what will be the output of the program ? <syntaxhighlight lang="c">

  1. include<stdio.h>
  2. include<math.h>

int main() {

   float a=5.375;
   char *p;
   int i;
   p = (char*)&a;
   for(i=0; i<2; i++)
       printf("%02x ", (unsigned char)(p[i]^p[3-i]));
   return 0;

} </syntaxhighlight> Ans:


40. Consider the following program: <syntaxhighlight lang="c">

  1. include<stdio.h>

int main() {

   char str[] = {'a','b','c','\0'};
   str[0] -= 32;
   printf("%s",str);
   return 0;

} </syntaxhighlight> What is the output of the above code?

Ans:


41. What is the following function doing? <syntaxhighlight lang="c"> int foo(int n) {

   int sum = 0;
   while(n > 0)
   {
       n = n & n-1;
       sum++;
   }
   return sum;

} </syntaxhighlight> Ans:


42. What is the following function doing? <syntaxhighlight lang="c"> int foo(int a, int b) {

   int c = a, d = b;
   while(a != b)
   {
       if(a < b)
           a = a+c;
       else
           b = b+d;
   }
   return a;

} </syntaxhighlight> Ans:


43. What is the following function doing? <syntaxhighlight lang="c"> int foo( int a, int b) {

   int c = a-b;
   c = c&(0x80000000);
   return (!c)*a +(!!c)*b;

} </syntaxhighlight> Ans:


44. What is the following function doing? <syntaxhighlight lang="c"> unsigned fun(unsigned a, unsigned b) {

   int i;
   unsigned  j = 0;
   for(i = 0; i < 32; i++)
   {
       j <<= 1;
       j += !!(a & 0x80000000);
       a <<= 1;
       if(j >=b)
       {
           j -= b;
           a++;
       }
   }
   return a;

} </syntaxhighlight> Ans:


45. What is the following function doing? <syntaxhighlight lang="c"> unsigned fun(unsigned int a) {

   unsigned int i, x = 0, y = 0, z = 0;
   for(i = 0; i < 16; i++)
   {
      	y <<= 2;
      	y += !!(a & 0x80000000) << 1;
      	y += !!(a & 0x40000000);
      	a <<= 2;
      	x = x + (x&1);
      	x <<= 1;
      	z <<= 1;
      	if(x + 1 <= y)
      	{
           x++;
           z++;

y-=x;

       }
   }
   return z;

} </syntaxhighlight> Ans:



46. Write the code to dynamically allocate a 2-D array of size m x n.

Ans:



47. Declare a pointer to a function accepting an integer and returning void.

Ans:


48. Write the condition so that the below code outputs “Hello World”. <syntaxhighlight lang="c">

  1. include<stdio.h>

int main() {

   if(<condition>)
   {

printf("Hello ");

   }
   else
   {

printf("World\n");

   }
   return 0;

} </syntaxhighlight> Ans:


49. Write a one line code to check if a number is a power of 2.

Ans:


50. Write a one line code to invert the last four bits of an integer.

Ans:


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1. What is the output of this program? <syntaxhighlight lang="c">

  1. include<stdio.h>

int main() {

   char *ptr;
   char string[] = "How are you?";
   ptr = string;
   ptr += 4;
   printf("%s",ptr);
   
   return 0;

} </syntaxhighlight> (a) How are you?

(b) are you?

(c) are

(d) No output


2. Which of the following will print the value 2 for the above code? <syntaxhighlight lang="c">

  1. include<stdio.h>

int main() {

   int a[10][20][30] = {0};
   a[5][2][1] = 2;
   return 0;

} </syntaxhighlight> (a) printf("%d",*(((a+5)+2)+1));

(b) printf("%d",***((a+5)+2)+1);

(c) printf("%d",*(*(*(a+5)+2)+1));

(d) None of these


3. What is the output of the following program? <syntaxhighlight lang="c">

  1. include<stdio.h>

int main() {

   int a = 5;
   int b = ++a * a++;
   printf("%d ",b);
   return 0;

} </syntaxhighlight> (a)25

(b) 30

(c) 36

(d) Undefined Behavior


4. What is the output of the following program? <syntaxhighlight lang="c">

  1. include<stdio.h>

int main() {

   int a = 5;
   switch(a)
   {
       default:
       a = 4;
       case 6:
           a--;
       case 5:
           a = a+1;
       case 1:
           a = a-1;
   }
   printf("%d \n",a);
   return 0;

} </syntaxhighlight> (a)5

(b) 4

(c) 3

(d) None of these


5. What is the output of the following program? <syntaxhighlight lang="c">

  1. include<stdio.h>

int main() {

   int a = 2,b = 5;
   a = a^b;
   b = b^a;
   printf("%d %d",a,b);
   return 0;

} </syntaxhighlight> (a)5 2

(b) 2 5

(c) 7 7

(d) 7 2


6. What is the output of the following program? <syntaxhighlight lang="c">

  1. include <stdio.h>

int main() {

   int a[][3] = {1, 2, 3, 4, 5, 6};
   int (*ptr)[3] = a;
   printf("%d %d ", (*ptr)[1], (*ptr)[2]);
   ++ptr;
   printf("%d %d\n", (*ptr)[1], (*ptr)[2]);
   return 0;

} </syntaxhighlight> (a)2 3 5 6

(b) 2 3 4 5

(c) 4 5 0 0

(d) none of the above


7. What is the output of the following program? <syntaxhighlight lang="c">

  1. include <stdio.h>

void f(char**);

int main() {

   char *argv[] = { "ab", "cd", "ef", "gh", "ij", "kl" };
   f(argv);
   return 0;

} void f(char **p) {

   char *t;
   t = (p += sizeof(int))[-1];
   printf("%s\n", t);

} </syntaxhighlight> (a)ab

(b) cd

(c) ef

(d) gh


8. What is the output of the following program? <syntaxhighlight lang="c">

  1. include <stdarg.h>
  2. include <stdio.h>

int ripple(int n, ...) {

   int i, j, k;
   va_list p;
   k = 0;
   j = 1;
   va_start(p, n);
   for (; j < n; ++j)
   {
       i = va_arg(p, int);
       k += i;
   }
   va_end(p);
   
   return k;

} int main() {

   printf("%d\n", ripple(3, 5, 7));
   return 0;

} </syntaxhighlight> (a)12

(b) 5

(c) 7

(d) 15


9. What is the output of the following program? <syntaxhighlight lang="c">

  1. include <stdio.h>

int counter(int i) {

   static int count = 0;
   count = count + i;
   
   return count;

}

int main() {

   int i, j;
   for (i = 0; i <= 5; i++)
       j = counter(i);
   printf("%d\n", j);
   return 0;

} </syntaxhighlight> (a)10

(b) 15

(c) 6

(d) 7


10. What is the output of the following program? <syntaxhighlight lang="c">

  1. include<stdio.h>

int main() {

   const int x = 5;
   const int *ptrx;
   ptrx = &x;
   *ptrx = 10;
   printf("%d\n", x);
   return 0;

} </syntaxhighlight> (a)5

(b) 10

(c) Compile Error

(d) Garbage value


11. What is the output of the following program? <syntaxhighlight lang="c">

  1. include<stdio.h>
  2. define x 4+1

int main() {

   int i;
   i = x*x*x;
   printf("%d",i);
   return 0;

} </syntaxhighlight> (a)125

(b) 13

(c) 17

(d) None of above


12. What is the output of the following program? <syntaxhighlight lang="c">

  1. include<stdio.h>

int main() {

   char c=125;
   c=c+10;
   printf("%d",c);
   return 0;

} </syntaxhighlight> (a)135

(b) +INF

(c) -121

(d) -8


13. What is the output of the following program? <syntaxhighlight lang="c">

  1. include<stdio.h>

int main() {

   int i=10;
   static int x=i;
   if(x==i)
       printf("Equal");
   else if(x>i)
       printf("Greater");
   else
       printf("Lesser");
   return 0;

} </syntaxhighlight> (a)Equal

(b) Greater

(c) Lesser

(d) Compile Error


14. Consider the following code segment: <syntaxhighlight lang="c">

  1. include <stdlib.h>

int *f1() {

   int x = 10;
   return &x;

} int *f2() {

   int *ptr;
   *ptr = 10;
   return ptr;

} int *f3() {

   int *ptr;
   ptr = (int*) malloc(sizeof (*ptr));
   return ptr;

} </syntaxhighlight> Which of these functions uses pointers incorrectly?

(a)f3 only

(b) f1 and f3

(c) f1 and f2

(d) f1, f2, and f3


15. What is the output of the following program? <syntaxhighlight lang="c">

  1. include <stdio.h>

int main() {

   int i = 3;
   int j;
   j = sizeof(++i + ++i);
   printf("i=%d j=%d\n", i, j);
   return 0;

} </syntaxhighlight> (a)i=4 j=4

(b) i=3 j=4

(c) i=5 j=4

(d) the behavior is undefined


16. What is the output of the following program? <syntaxhighlight lang="c">

  1. include <stdio.h>

void f1(int*, int); void f2(int*, int); void (*p[2])(int*, int);

int main() {

   int a = 3;
   int b = 5;
   p[0] = f1;
   p[1] = f2;
   p[0](&a, b);
   printf("%d %d ", a, b);
   p[1](&a, b);
   printf("%d %d\n", a, b);
   return 0;

}

void f1(int *p, int q) {

   int tmp = *p;
   *p = q;
   q = tmp;

} void f2(int *p, int q) {

   int tmp = *p;
   *p = q;
   q = tmp;

} </syntaxhighlight> (a)5 5 5 5

(b) 3 5 3 5

(c) 5 3 3 5

(d) none of the above


17. What is the output of the following program? <syntaxhighlight lang="c">

  1. include <stdio.h>

void e(int);

int main() {

   int a = 3; 
   e(a);
   putchar('\n');
   return 0;

} void e(int n) {

   if (n > 0)
   {
       e(--n);
       printf("%d ", n);
       e(--n);
   }

} </syntaxhighlight> (a)0 1 2 0

(b) 0 1 2 1

(c) 1 2 0 1

(d) 0 2 1 1


18. Consider the following code segment: <syntaxhighlight lang="c"> typedef int (*test)(float*, float*); test tmp; </syntaxhighlight> What is the type of tmp?


(a)function taking two pointer-to-float arguments and returning pointer to int

(b) pointer to int

(c) pointer to function taking two pointer-to-float arguments and returning int

(d) none of the above


19. What is the output of the following program? <syntaxhighlight lang="c">

  1. include <stdio.h>

int main() {

   char p;
   char buf[10] = {1, 2, 3, 4, 5, 6, 9, 8};
   p = (buf + 1)[5];
   printf("%d\n", p);
   return 0;

} </syntaxhighlight> (a)5

(b) 6

(c) 9

(d) none of the above


20. What is the output of the following program? <syntaxhighlight lang="c">

  1. include <stdio.h>

int main() {

   struct node
   {
       int a;
       int b;
       int c;
   };
   struct node s = { 3, 5, 6 };
   struct node *pt = &s;
   printf("%d\n", *((int*)pt+1));
   return 0;

} </syntaxhighlight> (a)3

(b) 5

(c) 6

(d) 7


21. What is the output of the following program? <syntaxhighlight lang="c">

  1. include <stdio.h>

int main(void) {

   char a[5] = { 1, 2, 3, 4, 5 };
   char *ptr = (char*)(&a + 1);
   printf("%d %d\n", *(a + 1), *(ptr - 1));
   return 0;

} </syntaxhighlight> (a)Compile Error

(b) 2 1

(c) 2 5

(d) none of the above


22. What is the output of the following program? <syntaxhighlight lang="c">

  1. include <stdio.h>

void foo(int[][3]);

int main(void) {

   int a[3][3] = { {1, 2, 3}, {4, 5, 6}, {7, 8, 9} };
   foo(a);
   printf("%d\n", a[2][1]);
   return 0;

}

void foo(int b[][3]) {

   ++b;
   b[1][1] = 9;

} </syntaxhighlight> (a)8

(b) 9

(c) 7

(d) none of the above


23. Consider the following function: <syntaxhighlight lang="c"> int foo(int x, int n) {

   int val = 1;
   if (n > 0)
   {
       if (n % 2 == 1)
       val *= x;
       val *= foo(x * x, n / 2);
   }
   return val;

} </syntaxhighlight> What function of x and n is computed by foo? (a)x^n

(b) x×n

(c) nx

(d) none of the above

24. What is the output of the following program? <syntaxhighlight lang="c">

  1. include<stdio.h>

int main() {

   int a = 0;
   switch(a)
   {
       default:
           a = 4;
       case 6:
           a--;
       case 5:
           a = a+1;
       case 1:
           a = a-1;
   }
   printf("%d \n",a);
   return 0;

} </syntaxhighlight> (a)5

(b) 4

(c) 3

(d) 0


25. What is the output of the following program? <syntaxhighlight lang="c">

  1. include<stdio.h>

int main() {

   int a = 2;
   if(a == (1,2))
       printf("Hello");
   if(a == 1,2)
       printf("World");
   return 0;

} </syntaxhighlight> (a)Hello

(b) World

(c) Hello World

(d) Compile Error


26. What is the output of the following program? <syntaxhighlight lang="c">

  1. include<stdio.h>

int main() {

   int a = 1,2;
   int b = (1,2);
   if(a == b)
       printf("Equal");
   else
       printf("Not Equal");
   return 0;

} </syntaxhighlight> (a)Equal

(b) Not Equal

(c) Compiler Dependent

(d) Compile Error


27. What is the output of the following program? <syntaxhighlight lang="c">

  1. include<stdio.h>

void foo(char *);

int main() {

   char *string = "Hello";
   foo(string);
   printf("%s",string);
   return 0;

}

void foo(char *a) {

   while(*a)
   {
       *a += 1;
       a++;
   }

} </syntaxhighlight> (a)Hello

(b) Ifmmp

(c) Compile Error

(d) Segmentation fault


28. What is the output of the following program? <syntaxhighlight lang="c">

  1. include<stdio.h>
  2. include<stdlib.h>

int main() {

   char s[] = "Opendays2012";
   int i = 0;
   while(*(s++))
       i++;
   printf("%d",i);
   return 0;

} </syntaxhighlight> (a)Segmentation Fault

(b) Compile Error

(c) 12

(d) 0


29. What is the output of the following program? <syntaxhighlight lang="c">

  1. include<stdio.h>

int a = 10; int main() {

   fun();
   fun();
   return 0;

}

int fun() {

   static int a = 1;
   printf("%d ",a);
   a++;
   return 0;

} </syntaxhighlight> (a)1 2

(b) 1 1

(c) 10 11

(d) 10 10


30. What is the output of the following program? <syntaxhighlight lang="c">

  1. include <stdio.h>
  2. define crypt(s,t,u,m,p,e,d) m##s##u##t
  3. define begin crypt(a,n,i,m,a,t,e)

int begin() {

   printf("Hello\n");
   return 0;

} </syntaxhighlight> (a)Hello

(b) Link error

(c) Segmentation fault

(d) Compiler error


31. Consider the following program: <syntaxhighlight lang="c">

  1. include<stdio.h>

int main() {

   int a[10][20][30]={0};
   printf("%ld",&a+1 - &a);
   return 0;

} </syntaxhighlight> What is the output of this program? Ans:


32. Consider the following program: <syntaxhighlight lang="c">

  1. include<stdio.h>

int main() {

   int a[10][20][30] = {0};
   int *b = a;
   int *c = a+1;
   printf("%ld", c-b);
   return 0;

} </syntaxhighlight> What is the output of this program? (You may ignore compiler warnings)

Ans:


33. Consider the following program: <syntaxhighlight lang="c">

  1. include<stdio.h>
  2. include<stdlib.h>

int* fun();

int main() {

   int *a = fun();
   printf("%d",*a);
   return 0;

} int* fun() {

   int *a =(int*) malloc(sizeof(int));
   *a = 10;
   return a;

} </syntaxhighlight> What is the output of this program? Ans:


34. Consider the following program: <syntaxhighlight lang="c">

  1. include<stdio.h>

int main() {

   int *a = fun();
   printf("%d",*a);
   return 0;

} int fun() {

   int a = 10;
   return a;

} </syntaxhighlight> What is the output of this program? Ans:


35. Consider the following program: <syntaxhighlight lang="c">

  1. include<stdio.h>
  2. include<string.h>

int main() {

   char string[] = "Hello";
   printf("%lu %lu",sizeof(string),strlen(string));
   return 0;

} </syntaxhighlight> What is the output of this program? Ans:


36. Consider the following program: <syntaxhighlight lang="c">

  1. include<stdio.h>

int main() {

   float a = 0.5;
   if(a == 0.5)
       printf("Yes");
   else
       printf("No");
   return 0;

} </syntaxhighlight> What is the output of this program? Ans:


37. Consider the following program: <syntaxhighlight lang="c">

  1. include<stdio.h>
  2. include<string.h>

void foo(char *);

int main() {

   char a[100] = {0};
   printf("%lu %lu",sizeof(a),strlen(a));
   return 0;

} </syntaxhighlight> What is the output of this program? Ans:



38. Consider the following program: <syntaxhighlight lang="c">

  1. include<stdio.h>

int main() {

   int a;
   printf("%d",scanf("%d",&a));
   return 0;

} </syntaxhighlight> What is the output of the above code?

Ans:

39. If the binary equivalent of 5.375 in normalised form is 0100 0000 1010 1100 0000 0000 0000 0000, what will be the output of the program ? <syntaxhighlight lang="c">

  1. include<stdio.h>
  2. include<math.h>

int main() {

   float a=5.375;
   char *p;
   int i;
   p = (char*)&a;
   for(i=0; i<2; i++)
       printf("%02x ", (unsigned char)(p[i]^p[3-i]));
   return 0;

} </syntaxhighlight> Ans:


40. Consider the following program: <syntaxhighlight lang="c">

  1. include<stdio.h>

int main() {

   char str[] = {'a','b','c','\0'};
   str[0] -= 32;
   printf("%s",str);
   return 0;

} </syntaxhighlight> What is the output of the above code?

Ans:


41. What is the following function doing? <syntaxhighlight lang="c"> int foo(int n) {

   int sum = 0;
   while(n > 0)
   {
       n = n & n-1;
       sum++;
   }
   return sum;

} </syntaxhighlight> Ans:


42. What is the following function doing? <syntaxhighlight lang="c"> int foo(int a, int b) {

   int c = a, d = b;
   while(a != b)
   {
       if(a < b)
           a = a+c;
       else
           b = b+d;
   }
   return a;

} </syntaxhighlight> Ans:


43. What is the following function doing? <syntaxhighlight lang="c"> int foo( int a, int b) {

   int c = a-b;
   c = c&(0x80000000);
   return (!c)*a +(!!c)*b;

} </syntaxhighlight> Ans:


44. What is the following function doing? <syntaxhighlight lang="c"> unsigned fun(unsigned a, unsigned b) {

   int i;
   unsigned  j = 0;
   for(i = 0; i < 32; i++)
   {
       j <<= 1;
       j += !!(a & 0x80000000);
       a <<= 1;
       if(j >=b)
       {
           j -= b;
           a++;
       }
   }
   return a;

} </syntaxhighlight> Ans:


45. What is the following function doing? <syntaxhighlight lang="c"> unsigned fun(unsigned int a) {

   unsigned int i, x = 0, y = 0, z = 0;
   for(i = 0; i < 16; i++)
   {
      	y <<= 2;
      	y += !!(a & 0x80000000) << 1;
      	y += !!(a & 0x40000000);
      	a <<= 2;
      	x = x + (x&1);
      	x <<= 1;
      	z <<= 1;
      	if(x + 1 <= y)
      	{
           x++;
           z++;

y-=x;

       }
   }
   return z;

} </syntaxhighlight> Ans:



46. Write the code to dynamically allocate a 2-D array of size m x n.

Ans:



47. Declare a pointer to a function accepting an integer and returning void.

Ans:


48. Write the condition so that the below code outputs “Hello World”. <syntaxhighlight lang="c">

  1. include<stdio.h>

int main() {

   if(<condition>)
   {

printf("Hello ");

   }
   else
   {

printf("World\n");

   }
   return 0;

} </syntaxhighlight> Ans:


49. Write a one line code to check if a number is a power of 2.

Ans:


50. Write a one line code to invert the last four bits of an integer.

Ans:


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