Copy set bits in a range in C++

C++Server Side ProgrammingProgramming

In this tutorial, we will be discussing a program to copy set bits of one number to another in the given range.

For this we will be provided with two integers. Our task is to see the bits in the first number and set those bits in the second number as well if they are in the given range. Finally returning the digit produced.


 Live Demo

#include <bits/stdc++.h>
using namespace std;
//copying set bits from y to x
void copySetBits(unsigned &x, unsigned y,
unsigned l, unsigned r){
   //l and r should be between 1 and 32
   if (l < 1 || r > 32)
      return ;
   for (int i=l; i<=r; i++){
      int mask = 1 << (i-1);
      if (y & mask)
      x = x | mask;
int main() {
   unsigned x = 10, y = 13, l = 2, r = 3;
   copySetBits(x, y, l, r);
   cout << "Modified x: " << x;
   return 0;


Modified x: 14
Published on 29-Jan-2020 07:18:33