题解 | #整数与IP地址间的转换#

const readline = require('readline')
const r = readline.createInterface({
    input: process.stdin,
    output: process.stdout
})

r.on('line', (ip) => {
    let ipArr = ip.split('.')
    if (ipArr.length>1) {
        let res = 0
        for(let i = 0; i < ipArr.length; i++) {
            res += ipArr[i] * Math.pow(2, (3-i)*8)
        }
        console.log(res)
    } else {
        let res = []
        for (let i = 1; i <= 4; i++){
            let remain = Math.floor(ip%Math.pow(2, 8))
            ip = ip >>> 8
            res =`${remain}.${res}`
        }
        console.log(res.slice(0, -1))
    }    
})