js & bitwise-operators

js & bitwise-operators

不用加减乘除运算符, 求整数的7倍

"use strict";

/**
 *
 * @author xgqfrms
 * @license MIT
 * @copyright xgqfrms
 * @created 2019-08-15
 *
 * @description bitwise-operators
 * @description 不用加减乘除运算符, 求整数的7倍
 * @description 7 times, without multiplication
 * @augments
 * @example
 * @link https://www.cnblogs.com/xgqfrms/p/11355923.html
 *
 */

let log = console.log;

// 7 times, without multiplication
const autoSeventTimes = (num = 0, times = 7) => {
    num = Math.abs(num);
    let x = Math.floor(times / 2);
    return (num << x) - num;
};

let xyz = autoSeventTimes(3);
// 21

console.log(`xyz =`, xyz);

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