【JavaScript】7-36 复数四则运算 (15 分)

题目：

本题要求编写程序，计算2个复数的和、差、积、商。

输入格式：

输入在一行中按照a1 b1 a2 b2的格式给出2个复数C1=a1+b1i和C2=a2+b2i的实部和虚部。题目保证C2不为0。

输出格式：

分别在4行中按照(a1+b1i) 运算符 (a2+b2i) = 结果的格式顺序输出2个复数的和、差、积、商，数字精确到小数点后1位。如果结果的实部或者虚部为0，则不输出。如果结果为0，则输出0.0。

输入样例1：

2 3.08 -2.04 5.06

输出样例1：

(2.0+3.1i) + (-2.0+5.1i) = 8.1i
(2.0+3.1i) - (-2.0+5.1i) = 4.0-2.0i
(2.0+3.1i) * (-2.0+5.1i) = -19.7+3.8i
(2.0+3.1i) / (-2.0+5.1i) = 0.4-0.6i

输入样例2：

1 1 -1 -1.01

输出样例2：

(1.0+1.0i) + (-1.0-1.0i) = 0.0
(1.0+1.0i) - (-1.0-1.0i) = 2.0+2.0i
(1.0+1.0i) * (-1.0-1.0i) = -2.0i
(1.0+1.0i) / (-1.0-1.0i) = -1.0

JavaScript代码：

const { parse } = require('path')
let readline = require('readline')

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

rl.on('line',function(line){
    let tokens = line.split(' ')
    let a1 = parseFloat(tokens[0])
    let b1 = parseFloat(tokens[1])
    let a2 = parseFloat(tokens[2])
    let b2 = parseFloat(tokens[3])

    let ret = main(a1, b1, a2, b2)
    console.log(ret)
})

function main(a1, b1, a2,b2) {
    let ret = new String()
    let mid1 = new String()
    let mid2 = new String()

    if (b1 < 0) {
        mid1 = ''
    } else {
        mid1 = '+'
    }

    if (b2 < 0) {
        mid2 = ''
    } else {
        mid2 = '+'
    }
    

    ret = '(' + a1.toFixed(1) + mid1 + b1.toFixed(1) + 'i' + ')' + ' + ' + '(' + a2.toFixed(1) + mid2 + b2.toFixed(1) +'i' + ')' + ' = ' + dealData( sum(a1, b1, a2,b2) ) + '
' + '(' + a1.toFixed(1) + mid1 + b1.toFixed(1) + 'i' + ')' + ' - ' + '(' + a2.toFixed(1) + mid2 + b2.toFixed(1) +'i' + ')' + ' = ' + dealData( difference(a1, b1, a2,b2) ) + '
' + '(' + a1.toFixed(1) + mid1 + b1.toFixed(1) + 'i' + ')' + ' * ' + '(' + a2.toFixed(1) + mid2 + b2.toFixed(1) +'i' + ')' + ' = ' + dealData( product(a1, b1, a2,b2) ) + '
' + '(' + a1.toFixed(1) + mid1 + b1.toFixed(1) + 'i' + ')' + ' / ' + '(' + a2.toFixed(1) + mid2 + b2.toFixed(1) +'i' + ')' + ' = ' + dealData( quotient(a1, b1, a2,b2) )

    return ret
}

function sum(a1, b1, a2,b2) {
    let treal = a1 + a2
    let timag = b1 + b2
    let frac = {
        real : treal.toFixed(1),
        imag : timag.toFixed(1)
    }

    return frac
}

function difference(a1, b1, a2,b2) {
    let treal = a1 - a2
    let timag = b1 - b2
    let frac = {
        real : parseFloat(treal).toFixed(1),
        imag : parseFloat(timag).toFixed(1)
    }

    return frac
}

function product(a1, b1, a2,b2) {
    let treal = a1 * a2 - b1 * b2
    let timag = a1 * b2 + a2 * b1
    let frac = {
        real : parseFloat(treal).toFixed(1),
        imag : parseFloat(timag).toFixed(1)
    }

    return frac
}

function quotient(a1, b1, a2,b2) {
    let treal = (a1 * a2 + b1 * b2) / (a2 * a2 + b2 * b2)
    let timag = (a2 * b1 - a1 * b2) / (a2 * a2 + b2 * b2)
    let frac = {
        real : parseFloat(treal).toFixed(1),
        imag : parseFloat(timag).toFixed(1)
    }

    return frac
}

function dealData(frac) {
    let ret = new String()
    let mid = new String()

    if (frac.imag < 0) {
        mid = ''
    } else {
        mid = '+'
    }
    if (frac.real == 0.0 && frac.imag == 0.0) {
        ret = frac.real
    }
    else if (frac.real == 0.0 && frac.imag != 0.0) {
        ret = frac.imag + 'i'
    }
    else if (frac.real != 0.0 && frac.imag == 0.0) {
        ret = frac.real
    }
    else if (frac.real != 0.0 && frac.imag != 0.0) {
        ret = frac.real + mid + frac.imag + 'i'
    }

    return ret
}