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

Call print_bits(memory address of variable, size of variable in byte).

void print_bits(void *ptr, int size) //ptr = memory address of variable, size = size of variable in byte
{
    long long *ch = ptr;
    int size_bits = size * 8;
    for(int i = size_bits-1; i>=0; i--){
        printf("%lld", *ch >> i & 1) ;
    }
}

It has been tested successfully, working with any variable of less than or equal to 64 bits. This will probably work correctly with variables with other sizes (Not Tested).

Calling:

double d = -7.92282286274e+28;
print_bits(&d, sizeof(d));

Output:

1100010111110000000000000000000011100000000000000000000100010111