Printing an unsigned integer in bits : Integer Family « Data Type « C Tutorial

1. C Tutorial
2. Data Type
3. Integer Family

#include <stdio.h>

int main() { 
   unsigned value = 7;
   unsigned c; 
   unsigned displayMask = 1 << 31; 

   printf( "%10u = ", value );
   for ( c = 1; c <= 32; c++ ) { 
      putchar( value & displayMask ? '1' : '0' );
      value <<= 1;

      if ( c % 8 == 0 ) {
         putchar( ' ' );
      }
   }
   return 0;
}

7 = 00000000 00000000 00000000 00000111