Adds two nums without '+' operation. (Works for positives only)

BinaryAdder.cpp

/* 
 * Addition using bitwise operations
 */        
int binary_adder(int a, int b)
{
    int sum = 0, pos = 0;

    bool bit = 0, carry = 0;
    while(a || b) {
        // At each position i bitwise sum is the xor
        // of bit of a,b at i and carry over 
        bit = (a^b)&1 ^ carry;
        // Carry over occurs when both bits are set or
        // atleast one of them is set with a previous carry
        carry = (a&b)&1 | (a|b)&carry;
        a >>= 1;
        b >>= 1;
        // If the bit is set we add to sum.
        sum |= bit << pos;
        pos++;
    }


    // Finally if there is a carry over we add to sum.
    sum |= carry << pos;
    
    return sum;
}