题解 | #取近似值#

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 i = line.indexOf(".");
        let z = line.slice(0, i);
        let x = line.slice(i);

        let x_num = parseFloat("0" + x);
        let z_num = parseInt(z);

        if (x_num >= 0.5) {
            console.log(z_num + 1);
        } else {
            console.log(z_num);
        }
    }
})();

输入的首先是字符串，将小数部分与整数部分分割，然后分别转换成小数和整数，小数部分与0.5比较，如果大于等于0.5，整数部分加一，否则不变。