A: void displayBits( unsigned value )

{

const int SHIFT = 8 * sizeof( unsigned ) - 1;

const unsigned MASK = 1<< SHIFT;

cout << setw(10 ) << value << " = ";

for ( unsigned i = 1; i <= SHIFT + 1; i++ )

{

cout << ( value & MASK ? '1' : '0' );

value <<= 1;

if ( i % 8 == 0 ) // output a space after bits cout << ' ';

}

cout << endl;

}

You may do the same by divide by 2, till the number is greator than 0. However you ought to use stack to print it in reverse order.