bitDiff.cpp

https://www.geeksforgeeks.org/problems/count-total-set-bits-1587115620/1

//{ Driver Code Starts
//Initial Template for C++

#include<bits/stdc++.h>
using namespace std;


// } Driver Code Ends
//User function Template for C++

class Solution{
    public:
    // Function to find number of bits needed to be flipped to convert A to B
    int countBitsFlip(int a, int b){
        
        // Your logic here
          int c=0;
        while(a>0 || b>0){
            if((a&1)!= (b&1)){
                c++;
            }
            a= a>>1;
            b= b>>1;
        }
        return c;
    }
};

//{ Driver Code Starts.

// Driver Code
int main()
{
	int t;
	cin>>t;// input the testcases
	while(t--) //while testcases exist
	{
		int a,b;
		cin>>a>>b; //input a and b

        Solution ob;
		cout<<ob.countBitsFlip(a, b)<<endl;
	}
	return 0;
}
// } Driver Code Ends