Sum of Two Integers in Python

Suppose we have two integers a and b. Our task is to find the sum of these two integers. One constraint is that, we cannot use any operator like + or -. So if a = 5 and b = 7, the result will be 12.

To solve this, we will follow these steps −

• For solving we will use the bitwise logical operators
• If b = 0, then return a
• otherwise, recursively use the sum function by providing an XOR b, and a AND b after left shifting the result one time

Example (Python)

Let us see the following implementation to get a better understanding −

 Live Demo

#include <iostream>
using namespace std;
class Solution {
   public:
   int getSum(int a, int b) {
      return b == 0?a:getSum(a^b, (unsigned int)(a&b)<<1);
   }
};
main(){
   Solution ob;
   cout<<ob.getSum(5,7)<<endl;
}

Input

a = 5
b = 7

Output

12