Rationale behind 'warning: array subscript is of type 'char''?

Asked Nov 11 '13 at 02:34

Active Nov 11 '13 at 02:43

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I've often wondered about the rationale behind the warning: array subscript is of type 'char' warning. I know I can cast it to an int or turn the warning off with -Wno-char-subscripts, but why is this considered an issue worth warning about? Does it have to do with the small of range of char? Or something else I'm not thinking of?

#include <stdio.h>
int main(void) {
        char a[10], i = 0;
        a[i] = 0; // i is a char, hence the warning.
        return 0;
}

Thanks for enlightening me.

edited Nov 11 '13 at 02:43

asked Nov 11 '13 at 02:34

Charlie Burns

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You are right, I didn't paste what I compiled! How many times have I ragged on people for doing that? Yikes. Let me edit... – Charlie Burns Nov 11 '13 at 02:43
@WhozCraig, thanks for the link. I looked but obviously not hard enough. – Charlie Burns Nov 11 '13 at 02:45
yeah. I know the feeling. Now it also warns-up on my clang as well. – WhozCraig Nov 11 '13 at 02:49

Rationale behind 'warning: array subscript is of type 'char''?

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