sum_of_a_and_b_not_+_-

int getSum(int a, int b) {
    int sum = a;
    while (b != 0)
    {
        sum = a ^ b;//calculate sum of a and b without thinking the carry 
        b = (a & b) << 1;//calculate the carry
        a = sum;//add sum(without carry) and carry
    }
    return sum;
}