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why this program goes to infinite loop #include<stdio.h&g...

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Question by madhur
Submitted on 8/19/2003
Related FAQ: Objective-C FAQ
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why this program goes to infinite loop
int arr[10];
int x;
void main(void)

Answer by max
Submitted on 5/2/2004
Rating: Not yet rated Rate this answer: Vote
Because of a bug in it.

In C/C++/Obj-C and others, arrays starts at pos 0 not 1, your "for" statement should be


As for the fact it goes into loop (instead of a crash) is compiler related (or better global variables storage related).

What happens here is that when writing arr[10]=-100 you're actually overwriting the location where x is stored (that is right after your arr given the declaration) so making x=-100, at this point the next loop will go to arr[-100] writing back to arr[9], and then again restarting.

You are lucky there was not important data between location arr[-100] and arr[9], it there were, a crash would have been more than probable.


Answer by max
Submitted on 5/2/2004
Rating:  Rate this answer: Vote
Sorry about the again faulty correction

The fix for the loop is:




Sorry 'bout that.


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