how to print memory bits in c

Question

I\'m learning how numbers are represented in memory. I want to know how to print the actual representation (binary or hexadecimal) in memory of some int and float variables.

Answer 1

#include 
#include 

void print_bits ( void* buf, size_t size_in_bytes )
{
    char* ptr = (char*)buf;

    for (size_t i = 0; i < size_in_bytes; i++) {
        for (short j = 7; j >= 0; j--) {
            printf("%d", (ptr[i] >> j) & 1);
        }
        printf(" ");
    }
    printf("\n");
}

int main ( void )
{
    size_t n;
    scanf("%d", &n);
    print_bits(&n, sizeof(n));
    return 0;
}

This prints bits of the specified object (n here) with the specified size (in bytes).