题解 | 求int型正整数在内存中存储时1的个数

const rl = require("readline").createInterface({ input: process.stdin });
var iter = rl[Symbol.asyncIterator]();
const readline = async () => (await iter.next()).value;

void (async function () {
    // Write your code here
    while ((line = await readline())) {
        let tokens = line.split(" ");
        let num = parseInt(tokens[0]);
        let count = 0, a = 1;
        while (num > 0) {
			// 判断是否 存在 1 使用与运算；
            if ((num & a) == 1) {
                count++;
            }
			// 右移一位，相当于除以2；
            num = num >> 1;
        }
        console.log(count);
    }
})();