C++ Program to Perform Addition Operation Using Bitwise Operators

Bitwise operators are used to perform bitwise operations. That implies the manipulation of bits. Some of the bitwise operators are bitwise AND, bitwise OR, bitwise XOR etc.

A program to perform addition operation using bitwise operators is given below −

Example

#include<iostream>
using namespace std;
int main() {
   int num1, num2, carry;
   cout << "Enter first number:"<<endl;
   cin >> num1;
   cout << "Enter second number:"<<endl;
   cin >> num2;

   while (num2 != 0) {
      carry = num1 & num2;
      num1 = num1 ^ num2;
      num2 = carry << 1;
   }
   cout << "The Sum is: " << num1;
   return 0;
}

Output

The output of the above program is as follows −

Enter first number:11
Enter second number: 5
The Sum is: 16

In the above program, the two numbers are obtained from the user. This is given below −

cout << "Enter first number:"<<endl;
cin >> num1;

cout << "Enter second number:"<<endl;
cin >> num2;

After that, addition is carried out using a while loop. It involves using the bitwise AND, bitwise XOR and left shift operators. The code snippet is given below −

while (num2 != 0) {
   carry = num1 & num2;
   num1 = num1 ^ num2;
   num2 = carry << 1;
}

Finally, the sum is displayed. This is given below −

cout << "The Sum is: " << num1;