Difference between revisions of "Unallocated Memory Reference"

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===Solution===
 
===Solution===
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int *a; // This declares a as an integer pointer, meaning a can point to a memory address which contains an int
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<syntaxhighlight lang="c">
 +
int *a;  
 +
</syntaxhighlight>
 +
This declares a as an integer pointer, meaning a can point to a memory address which contains an int
  
−
*a = 5; //Makes the content of the address pointed to by a 5. But a is not pointing to any valid address (int *a assigns garbage value to a) and hence this assignment can cause segmentation fault
+
<syntaxhighlight lang="c">
 +
*a = 5;  
 +
</syntaxhighlight> This makes the content of the address pointed to by a 5. But a is not pointing to any valid address (int *a assigns garbage value to a) and hence this assignment can cause segmentation fault
  
  
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<div class="fb-like"  data-layout="standard" data-action="like" data-show-faces="true" data-share="true"></div>
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<div class="fb-share-button"  data-type="button_count"></div>
 
<disqus/>
 
<disqus/>
  
 
[[Category:Coding Questions]]
 
[[Category:Coding Questions]]

Revision as of 13:40, 8 December 2013

<syntaxhighlight lang="c">

  1. include<stdio.h>

int main() { 

int *a;
*a=5;
printf("%d",a);

return 0;

}

</syntaxhighlight>

Solution

<syntaxhighlight lang="c"> int *a; </syntaxhighlight> This declares a as an integer pointer, meaning a can point to a memory address which contains an int

<syntaxhighlight lang="c">

  • a = 5;

</syntaxhighlight> This makes the content of the address pointed to by a 5. But a is not pointing to any valid address (int *a assigns garbage value to a) and hence this assignment can cause segmentation fault



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<syntaxhighlight lang="c">

  1. include<stdio.h>

int main() { 

int *a;
*a=5;
printf("%d",a);

return 0;

}

</syntaxhighlight>

Solution[edit]

<syntaxhighlight lang="c"> int *a; </syntaxhighlight> This declares a as an integer pointer, meaning a can point to a memory address which contains an int

<syntaxhighlight lang="c">

  • a = 5;

</syntaxhighlight> This makes the content of the address pointed to by a 5. But a is not pointing to any valid address (int *a assigns garbage value to a) and hence this assignment can cause segmentation fault



blog comments powered by Disqus