Question

How to determine whether a variable is unsigned or not in C

Answer 1

#include <stdio.h>

int main(void)
{
    unsigned int n = 30;

    if (n >= 0 && ~n >= 0) {
        puts("unsigned");
    }
    else {
        puts("signed");
    }


    int x = 30;

    if (x >= 0 && ~x >= 0) {
        puts("unsigned");
    }
    else {
        puts("signed");
    }

    return 0;
}




/*
run:

unsigned
signed

*/

 

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