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

@dbush, @Anton, I mixed your codes. It's okay?

#include 
#include 

void print_bytes( void *ptr, size_t size ) ;

int main( void )
{
    int x = 123456 ;
    double y = 3.14 ;

    print_bytes( &x, sizeof(x) ) ;
    print_bytes( &y, sizeof(y) ) ;

    return 0 ;
}

void print_bytes( void *ptr, size_t size )
{
    //char *buf = (char*) ptr;
    unsigned char *p = ptr ;

    for( size_t i = 0; i < size; i++ )
    {
        printf( "%02hhX ", p[i] ) ;
    }
    printf( "\n" ) ;

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