题解 | #整数与IP地址间的转换#

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 str = line
       if (str.includes('.')) {
         const arr = str.split('.')
         let total = 0
         for (let i = 0 ; i < arr.length; i++) {
           const num = arr[i] * Math.pow(2, 8*(arr.length-1 - i))
           total += num
         }
         console.log(total)
       } else {
         str = Number(str).toString(2)
         if (str.length < 32) {
            str = new Array(32 - str.length).fill('0').join('') + str
         }
         let ip = []
         for (i = 0; i < 4; i++) {
           ip.push(parseInt(str.slice(i * 8, (i+1) * 8), 2))
         }
         console.log(ip.join('.'))
       }
    }
}()