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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