What is the best way to add two numbers without using the + operator?

Question

A friend and I are going back and forth with brain-teasers and I have no idea how to solve this one. My assumption is that it\'s possible with some bitwise operators, but n

Answer 1

Here is the solution in C++, you can find it on my github here: https://github.com/CrispenGari/Add-Without-Integers-without-operators/blob/master/main.cpp

int add(int a, int b){
   while(b!=0){
      int sum = a^b; // add without carrying
      int carry = (a&b)<<1; // carrying without adding
      a= sum;
      b= carry;
    }
   return a;
 }
 // the function can be writen as follows :
 int add(int a, int b){
     if(b==0){
        return a; // any number plus 0 = that number simple!
    }
    int sum = a ^ b;// adding without carrying;
    int carry = (a & b)<<1; // carry, without adding
    return add(sum, carry);
  }