/*
 * @(#) set_bits.c - An implementation of 'setbits' function.
 * (c) 1995 Ivan Maidanski <ivmai@chat.ru> http://ivmai.chat.ru
 * Freeware program source. All rights reserved.
 **
 * Language: ANSI C
 * Tested with: BSD GNU CC
 * Last modified: 1995-10-28 11:35:00 GMT+04:00
 */

#include <stdio.h>

typedef unsigned int uint;

uint setbits(uint x,uint p,uint n,uint y) {
/* sets n bits into x at the position p from y */
  return x & ~(~(~0 << n) << (p+1-n)) |
          (y & ~(~0 << n)) << (p+1-n);
}

main () {
  uint x,y,p,n;
  printf("Enter Hex x: ");
  scanf("%x",&x);
  printf("Enter Hex y: ");
  scanf("%x",&y);
  printf("Enter p: ");
  scanf("%d",&p);
  printf("Enter n: ");
  scanf("%d",&n);
  printf("Result: %x \n",setbits(x,p,n,y));
}