Question

I am trying to find the address location in C of a specific variable now I try to write a code which is this :

#include<stdio.h>

int main()
{
        int g = 3;
        printf("%p %d %u ",&g,&g,&g);
        return 0;
}

now I am confused that why is GCC compiler is giving me warning using these :

Warnings are

warning: format '%d' expects type 'int', but argument 3 has type 'int *'
warning: format '%u' expects type 'unsigned int', but argument 4 has type 'int *'

Also the answers are quite amazing

0xbfa5953c -1079667396 3215299900

Now my question is which would I accept as a location to my number

Answer 1

The expression &g evaluates to the same value (bitwise) in every case. It’s just a matter of how those bits should be interpreted.

So it turns out that 0xbfa5953c (hex) == 3215299900 (dec), which is hardly surprising. The negative value is meaningless because a memory address is not a signed integer.