leetcode-javascript/371-sum-of-two-integers/sum-of-two-integers.js at master · loatheb/leetcode-javascript · GitHub

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// Calculate the sum of two integers a and b, but you are not allowed to use the operator + and -.
//
// Example:
// Given a = 1 and b = 2, return 3.
//
//
// Credits:Special thanks to @fujiaozhu for adding this problem and creating all test cases.


/**
 * @param {number} a
 * @param {number} b
 * @return {number}
 */
var getSum = function(a, b) {
    var c;
    while ((c = a & b) != 0) {
        a = a ^ b;
        b = c << 1;
    }
    return a ^ b;
};