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cintlong-long

Printing maximum values of INT

I try to print the maximum value of int in a program. Using the following code::

#include <stdio.h>
#include <limits.h>
int main(void) {
    printf("%d",INT_MAX);
    return 0;
}

The output I get is:: 2147483647

But, when I change my printf statement to printf("%lld",INT_MAX); my output becomes 577732524332023807. INT_MAX value is supposed to be inside the range of long long int, then why is it not able to convert INT_MAX into the correct number in long long int.

Thanks for any help in advance.

Solution

  • printf is a variadic function, it doesn't know its argument types, it relies on recieving the correct hints in the format string.

    You invoked undefined behaviour with "%lld", because you haven't passed a long long int.

    To fix it, you need to cast - then you'll see the correct result:

    printf("%lld", (long long int) INT_MAX);

    Enable compiler warnings? :)