Formatting of an unsigned long long causes an integer overflow

Question

The unsigned long long type doesn't work as expected for me. Here's my simple code:

#include <stdio.h>
#include <stdlib.h>

int main(int argc, char *argv[]) {
    unsigned long long a = 2932306814;
    printf("a = %d\n", a);
    return EXIT_SUCCESS;
}

I get the following output:

a = -1362660482

The used gcc was installed as part of mingw and has version 4.8.1.

score 3 · Accepted Answer · answered Dec 06 '15 at 19:06

3

You are not printing the number correctly. %d specifier is for an int. Use the specifier %llu for an unsigned long long.

Change to:

printf("a = %llu\n", a);

answered Dec 06 '15 at 19:06

nnn

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Great, that's it! Since its not the overflow issue but just formatting, I should reset the tags properly. – Danny Lo Dec 06 '15 at 19:08
@WeatherVane I am allowed to do it in 9 minutes. – Danny Lo Dec 06 '15 at 19:10

Formatting of an unsigned long long causes an integer overflow

1 Answers1