蓝桥杯复数运算

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

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


public class Main {
public static void main(String[] args){
Scanner in = new Scanner(System.in);
String operator = in.next();
double a = in.nextDouble();
double b = in.nextDouble();
double c = in.nextDouble();
double d = in.nextDouble();
char op = operator.charAt(0);
FuShu1 one = new FuShu1(a,b);
FuShu1 two = new FuShu1(c,d);
FuShu1 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 FuShu1 div(FuShu1 one, FuShu1 two) {
// TODO Auto-generated method stub
FuShu1 jieguo = new FuShu1((one.a*two.a+one.b*two.b)/(two.a*two.a+two.b*two.b),
(one.b*two.a-one.a*two.b)/(two.a*two.a+two.b*two.b));
return jieguo;
}
private static FuShu1 mul(FuShu1 one, FuShu1 two) {
// TODO Auto-generated method stub
FuShu1 jieguo = new FuShu1(one.a*two.a-one.b*two.b,one.b*two.a+one.a*two.b);
return jieguo;
}
private static FuShu1 sub(FuShu1 one, FuShu1 two) {
// TODO Auto-generated method stub
FuShu1 jieguo = new FuShu1(one.a-two.a,one.b-two.b);
return jieguo;
}
private static FuShu1 add(FuShu1 one, FuShu1 two) {
// TODO Auto-generated method stub
FuShu1 jieguo = new FuShu1(one.a+two.a,one.b+two.b);
return jieguo;
}
public static class FuShu1{
public double a;
public double b;
public FuShu1(double a,double b){
this.a = a;
this.b = b;
}
public String toString(){
DecimalFormat format = new DecimalFormat("0.00");  //格式化保存小数点后两位
return format.format(a)+"+"+format.format(b)+"i";
}
}
}