Programming

#include "stdio.h"
#include "stdlib.h"

void show_bits( unsigned char byte )
{
    int i;

    printf( "%d =", (unsigned int) byte );
    for( i = 0; i <  8; i++ )                   // for each bit
    {
        printf( "%d", byte & 0x80 ? 1 : 0 );    // test the high order (left) bit and print 1 if on
        byte <<= 1;                             // shift to the left 1 bit
    }
    printf( "\n" );                             // final newline
}

int main( int argc, char **argv )
{
    unsigned int    value;

    printf( "enter non-number or ctl-D to quit\n" );
    for( ; ; )
    {
        printf( "enter a number (0-255): " );
        if(  scanf( "%u", &value ) <= 0 )      // read value converting it to unsigned
        {
            printf( "\n" );
            exit( 0 );
        }
        if( value < 256 )
            show_bits( (unsigned char ) value  );   // typecast not necessary, but shows intent
        else
            printf( "%d is out of range for a byte\n", value );
    }
}

return 0;