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Return to Unallocated Memory Reference.
<syntaxhighlight lang="c">
int main() {
GATECSEint *a;
*a=5;
printf("%d",a);
return 0;
}
</syntaxhighlight>
<syntaxhighlight lang="c"> int *a; </syntaxhighlight> This declares a as an integer pointer, meaning 'a' can point to any memory address which contains an int
<syntaxhighlight lang="c">
</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