2016蓝桥杯假期任务之《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

代码：

import java.io.IOException;
import java.util.Scanner;

public class Main {
public static void main(String[] args) {
class Complex {
double real;
double image;

Complex() {
}

Complex(double real, double image) {
this.real = real;
this.image = image;
}

private void Complex(double real, double image) {
// TODO Auto-generated method stub
this.real = real;
this.image = image;
}

public double getReal() {
return real;
}

public void setReal() {
this.real = real;
}

public double getImage() {
return image;
}

public void setImage() {
this.image = image;
}

Complex add(Complex a) {
double real1 = a.getReal();
double image1 = a.getImage();
double newreal = real + real1;
double newimage = image + image1;
Complex newcomplex = new Complex(newreal, newimage);
return newcomplex;
}

Complex sub(Complex a) {
double real1 = a.getReal();
double image1 = a.getImage();
double newreal = real - real1;
double newimage = image - image1;
Complex newcomplex = new Complex(newreal, newimage);
return newcomplex;
}

Complex mul(Complex a) {
double real1 = a.getReal();
double image1 = a.getImage();
double newreal = real * real1 - image * image1;
double newimage = image * real1 + real * image1;
Complex newcomplex = new Complex(newreal, newimage);
return newcomplex;
}

Complex div(Complex a) {
double real1 = a.getReal();
double image1 = a.getImage();
double newreal = (real * real1 + image * image1)
/ (real1 * real1 + image1 * image1);
double newimage = (image * real1 - real * image1)
/ (real1 * real1 + image1 * image1);
Complex newcomplex = new Complex(newreal, newimage);
return newcomplex;
}

public void print() {
System.out.printf("%.2f+%.2fi",real,image);
}
}
char s = 0;
try {
s = (char)System.in.read();
} catch (IOException e) {
e.printStackTrace();
}
Scanner sc = new Scanner(System.in);
double real = sc.nextDouble();
double image = sc.nextDouble();
double real1 = sc.nextDouble();
double image1 = sc.nextDouble();
Complex data1 = new Complex(real,image);
Complex data2 = new Complex(real1,image1);
switch (s) {
case '+':
Complex result = data1.add(data2);
result.print();
break;
case '-':
Complex result1 = data1.sub(data2);
result1.print();
break;
case '*':
Complex result2 = data1.mul(data2);
result2.print();
break;
case '/':
Complex result3 = data1.div(data2);
result3.print();
break;
default:
break;
}
}
}

运行结果：

- 2.5 3.6 1.5 4.9

1.00+-1.30i

JAVA输入单个字符的方法：

char s = 0;
try {
s = (char)System.in.read();
} catch (IOException e) {
e.printStackTrace();
}