#include <stdio.h>
#define  SetBit(A,k)  ( A[k/32] |= (1<<(k%32)) ) 
#define  ClrBit(A,k)  ( A[k/32] &= ~(1<<(k%32)) ) 
#define  IsSet(A,k)   ( ( A[k/32] & (1<<(k%32)) ) != 0 )

int main( int argc, char* argv[] )
{
   int A[10];
   int i;

   for ( i = 0; i < 10; i++ )
      A[i] = 0;                    // Clear the bit array

   printf("Set bit poistions 100, 200 and 300\n");
   SetBit( A, 100 );               // Set 3 bits
   SetBit( A, 200 );
   SetBit( A, 300 );


   // Check if SetBit() works:

   for ( i = 0; i < 320; i++ )
      if ( IsSet(A, i) )
         printf("Bit %d was set !\n", i);

   printf("\nClear bit poistions 200 \n");
   ClrBit( A, 200 );

   // Check if ClearBit() works:

   for ( i = 0; i < 320; i++ )
      if ( IsSet(A, i) )
         printf("Bit %d was set !\n", i);
}