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jfager/overflow.c

Created June 21, 2013 15:28
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overflow.c
#include<stdio.h>
main() {
long long a = -9223372036854775808;
long long b = a * -1;
printf("%lld\n", b);
}
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jfager commented Jun 21, 2013

jasonf-mbp:overflow jasonf$ gcc -ftrapv overflow.c -o overflow
overflow.c:4:18: warning: integer constant is so large that it is unsigned
overflow.c: In function ‘main’:
overflow.c:4: warning: this decimal constant is unsigned only in ISO C90
jasonf-mbp:overflow jasonf$ ./overflow
-9223372036854775808

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