题解 | #学英语#

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

const map = {
    1: 'one',
    2: 'two',
    3: 'three',
    4: 'four',
    5: 'five',
    6: 'six',
    7: 'seven',
    8: 'eight',
    9: 'nine',
    10: 'ten',
    11: 'eleven',
    12: 'twelve',
    13: 'thirteen',
    14: 'fourteen',
    15: 'fifteen',
    16: 'sixteen',
    17: 'seventeen',
    18: 'eighteen',
    19: 'nineteen',
    20: 'twenty',
    30: 'thirty',
    40: 'forty',
    50: 'fifty',
    80: 'eighty'
}
function getTwo(first, second) {
    let num = first + second
    if (num >= 10 && num < 20) {
        return map[num];
    } else {
        if (first-0) {
            let res = ''
            if ([2, 3, 4, 5, 8].includes(first-0)) {
                res = `${map[first*10]} ${second > 0 ? map[second] : ''}`
            } else {
                res = `${map[first]}ty ${second > 0 ? map[second] : ''}`
            }
            return res
        } else {
            return map[second]
        }
    }
}
function getThree(first, second, third) {
    return `${first-0 ? map[first] + ' hundred ' : ''}${(first-0 && (second-0 || third-0) ? 'and ' : '')}${(second-0 || third-0 ) ? getTwo(second, third) : ''}`
}
function getFour(second, third, fourth) {
    return `thousand ${getThree(second, third, fourth)}`
}

void async function () {
    // Write your code here
    while(line = await readline()){
        let len = line.length
        let res = ''
        let [first, second, third, fourth, fifth, sixth, seventh] = line.split('')
        switch(len) {
            case 1: 
                res = map[line];
                break;
            case 2: 
                res = getTwo(first, second)
                break;
            case 3: 
                res = getThree(first, second, third)
                break;
            case 4: 
                res = `${map[first]} ${getFour(second, third, fourth)}`
                break;
            case 5: 
                res = `${getTwo(first, second)}${getFour(third, fourth, fifth)}`
                break;
            case 6: 
                res = `${getThree(first, second, third)} ${getFour(fourth, fifth, sixth)}`
                break;
            case 7: 
                res = `${map[first]} million ${getThree(second, third, fourth)} ${getFour(fifth, sixth, seventh)}`
                break;
            default: break
        }
        console.log(res)
    }
}()