/* shift.c

 * Demonstrates the different effects of setting bits
 * in combination with signed and unsigned "8-bit" data.
 */
#include <stdio.h>
#include <stdlib.h>

void print_binary(unsigned char number, int size)
{
  if (size == 0)
  {
    return;
  }
  if (size == 1)
  {
    putc((number & 1) ? '1' : '0', stdout);
    return;
  }
  print_binary(number >> 1, size - 1);
  putc((number & 1) ? '1' : '0', stdout);
}

// Function to set the kth bit of n
int setBit(int n, int k) { return (n | (1 << k)); }

// Function to clear the kth bit of n
int clearBit(int n, int k) { return (n & (~(1 << k))); }

// Function to toggle the kth bit of n
int toggleBit(int n, int k) { return (n ^ (1 << k)); }

// Driver code
int main(int argc, char **argv)
{
  unsigned char n = 0xaa;
  int k = 0;

  if (argc != 3)
  {
    printf("Usage:  ./bitop <number> (between 01 and 0xFF in hex) <pos>(between 0 and 7) \n");
    printf(" Kth bit to be manipulated\n");
    return 1;
  }

  n = (int)strtol(argv[1], NULL, 16);
  k = atoi(argv[2]);

  printf("Number :");
  print_binary(n, 8);
  printf("\n Set %d-th: ", k);
  print_binary(setBit(n, k), 8);
  printf("\n");

  printf("Number :");
  print_binary(n, 8);
  printf("\n Clear %d-th: ", k);
  print_binary(clearBit(n, k), 8);
  printf("\n");

  printf("Number :");
  print_binary(n, 8);
  printf("\n Toggle %d-th: ", k);
  print_binary(toggleBit(n, k), 8);
  printf("\n");
}