(Solution)
Line 29: Line 29:
 
===Solution===
 
===Solution===
 
Assume start location of arr s 1000.
 
Assume start location of arr s 1000.
So, 2 will be stored as follows:
+
So, the first two elements of the array will be stored in memory as follows:
  
  1000: 0 0 0 0 0 0 0 2 (each char is hexa decimal and assume int takes 4 bytes)
+
  1000: 0 0 0 0 0 0 0 2 (hexa decimal representation and assuming int takes 4 bytes)
 
  1004: 0 0 0 0 0 0 0 3
 
  1004: 0 0 0 0 0 0 0 3
  

Revision as of 13:26, 22 February 2014

What's the output?

<syntaxhighlight lang="c"> int main() {

       int arr[3] = {2, 3, 4};
       char *p;
       p = (char*)arr;
       printhex(p);
       printf("%p %d ",p, *p);
       p = p+1;
       printhex(p);
       printf("\n%p %d\n",p,*p);
       return 0;

}


</syntaxhighlight>


(A) 2 3

(B) 2 0

(C) 1 0

(D) Garbage value


Solution

Assume start location of arr s 1000. So, the first two elements of the array will be stored in memory as follows:

1000: 0 0 0 0 0 0 0 2 (hexa decimal representation and assuming int takes 4 bytes)
1004: 0 0 0 0 0 0 0 3

Now, %d, *p will print the first 4 bytes starting at 1000, that is 2. When p is incremented, it will go to 1001, as p is a char pointer.

1001: 0 0 0 0 0 0 0 0

So, output will be 0.





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What's the output?[edit]

<syntaxhighlight lang="c"> int main() {

       int arr[3] = {2, 3, 4};
       char *p;
       p = (char*)arr;
       printhex(p);
       printf("%p %d ",p, *p);
       p = p+1;
       printhex(p);
       printf("\n%p %d\n",p,*p);
       return 0;

}


</syntaxhighlight>


(A) 2 3

(B) 2 0

(C) 1 0

(D) Garbage value


Solution[edit]

Assume start location of arr s 1000. So, the first two elements of the array will be stored in memory as follows:

1000: 0 0 0 0 0 0 0 2 (hexa decimal representation and assuming int takes 4 bytes)
1004: 0 0 0 0 0 0 0 3

Now, %d, *p will print the first 4 bytes starting at 1000, that is 2. When p is incremented, it will go to 1001, as p is a char pointer.

1001: 0 0 0 0 0 0 0 0

So, output will be 0.





blog comments powered by Disqus