Thread: Mystery.

Hi,

I understand the following program, not that well but at least i know how it works. But i really can't figure out what it does. Pls give some hints.

Code:

#include <stdio.h>

int mystery( unsigned );

int main()
{ 
   unsigned x;

   printf( "Enter an integer: " );
   scanf( "%u", &x );
   printf( "\nThe result is %d\n", mystery( x ) );
   getch();
   return 0;
}

int mystery( unsigned bits )
{ 
   unsigned i, mask = 1 << 31, total = 0;

   for ( i = 1; i <= 32; i++, bits <<= 1 )
      if ( ( bits & mask ) == mask )
         ++total;

    return !( total % 2 ) ? 1 : 0;
}