蓝桥杯 算法训练 复数运算

　　编程实现两个复数的运算。设有两个复数 和 ，则他们的运算公式为：

　　要求：（1）定义一个结构体类型来描述复数。

　　（2）复数之间的加法、减法、乘法和除法分别用不用的函数来实现。

　　（3）必须使用结构体指针的方法把函数的计算结果返回。

　　说明：用户输入：运算符号(+,-,*,/) a b c d.

　　输出：a+bi，输出时不管a,b是小于0或等于0都按该格式输出，输出时a,b都保留两位。

输入：

　　- 2.5 3.6 1.5 4.9

输出：

　　1.00+-1.30i

package com.ALGO;

import java.text.DecimalFormat;
import java.util.Scanner;

public class _142{
public static class FuShu{
public FuShu(double a, double b) {
// TODO Auto-generated constructor stub
this.a = a;
this.b = b;
}
public double a;
public double b;
public String toString() {
DecimalFormat format = new DecimalFormat("0.00");
return format.format(a)+"+"+format.format(b)+"i";
}
}
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner scan = new Scanner (System.in);
String operator = scan.next();
char op = operator.charAt(0);
double a = scan.nextDouble();
double b = scan.nextDouble();
double c = scan.nextDouble();
double d = scan.nextDouble();
FuShu one = new FuShu(a,b);
FuShu two = new FuShu(c,d);
FuShu three = null;
switch(op){
case '+':three = add(one, two);break;
case '-':three = sub(one, two);break;
case '*':three = mul(one, two);break;
case '/':three = div(one, two);break;
}
System.out.println(three.toString());

}
private static FuShu div(FuShu one, FuShu two) {
FuShu temp = new FuShu((one.a*two.a+one.b*two.b)/(two.b*two.b+two.a*two.a), (one.b*two.a+one.a*two.b)/(two.b*two.b+two.a*two.a));
return temp;
}

private static FuShu mul(FuShu one, FuShu two) {
FuShu temp = new FuShu(one.a*two.a-one.b*two.b, one.a*two.b+one.b*two.a);
return temp;
}

private static FuShu sub(FuShu one, FuShu two) {
FuShu temp = new FuShu(one.a-two.a, one.b-two.b);
return temp;
}

private static FuShu add(FuShu one, FuShu two) {
FuShu temp = new FuShu(one.a+two.a, one.b+two.b);
return temp;
}

}

此处测试100分，有需要的同志就参考可以

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