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import java.io.*;
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class complex{
//复数类
public float realPart;
public float imagPart;
}
public class Main extends complex{
public static String readString(){
//从键盘读取字符串
BufferedReader br=new BufferedReader(new InputStreamReader(System.in),1);
String s1="";
try{
s1=br.readLine();
}catch(IOException ex){
System.out.println(ex);
}
return s1;
}
public static float readFloat(){
//字符串转换为浮点数
return Float.parseFloat(readString());
}
public static char plus(float r1,float r2,float i1,float i2){
//实现复数相加并输出
complex sum=new complex();
sum.imagPart=i1+i2;
sum.realPart=r1+r2;
if(sum.imagPart0){
//解决虚部为负时同时显示+ -号问题
sum.imagPart=-sum.imagPart;
System.out.println("两数相加="+sum.realPart+"-"+sum.imagPart+"i");
return 'f';
}
System.out.println("两数相加="+sum.realPart+"+"+sum.imagPart+"i");
return 'z';
}
public static char minus(float r1,float r2,float i1,float i2){
//实现复数相减并输出
complex cha=new complex();
cha.imagPart=i1-i2;
cha.realPart=r1-r2;
if(cha.imagPart0){
//解决虚部为负时同时显示+ -号问题
cha.imagPart=-cha.imagPart;
System.out.println("两数相减="+cha.realPart+"-"+cha.imagPart+"i");
return 'f';
}
System.out.println("两数相减="+cha.realPart+"+"+cha.imagPart+"i");
return 'z';
}
public static void main(String[] args) {
//主方法
complex a=new complex();
complex b=new complex();
System.out.println("输入第一个复数...");
System.out.print("\n实部=");
a.realPart=Main.readFloat();
System.out.print("虚部=");
a.imagPart=Main.readFloat();
System.out.println("\n输入第二个复数...");
System.out.print("\n实部=");
b.realPart=Main.readFloat();
System.out.print("虚部=");
b.imagPart=Main.readFloat();
System.out.println("\n");
Main.plus(a.realPart,b.realPart,a.imagPart,b.imagPart);
Main.minus(a.realPart,b.realPart,a.imagPart,b.imagPart);
}
}
以前做的 可以实现复数加减法。因为浮点数精度问题，输出可能会有点误差
public class Complex {
protected int a;
protected int b;
public Complex(int a, int b) {
this.a = a;
this.b = b;
}
public String toString() {
return this.a + " + " + this.b + "i";
}
public static Complex addition(Complex complex1, Complex complex2) {
int a = complex1.a + complex2.a;
int b = complex1.b + complex2.b;
return new Complex(a, b);
}
public static Complex subtract(Complex complex1, Complex complex2) {
int a = complex1.a - complex2.a;
int b = complex1.b - complex2.b;
return new Complex(a, b);
}
public static Complex multiplication(Complex complex1, Complex complex2) {
int a = complex1.a * complex2.a - complex1.b * complex2.b;
int b = complex1.b * complex2.a + complex1.a * complex2.b;
return new Complex(a, b);
}
public static Complex division(Complex complex1, Complex complex2) throws Exception {
if (complex2.a == 0) {
throw new Exception("complex2.a is 0");
}
if (complex2.b == 0) {
throw new Exception("complex2.b is 0");
}
int a = (complex1.a * complex2.a + complex1.b * complex2.b) / (complex2.a * complex2.a + complex2.b * complex2.b);
int b = (complex1.b * complex2.a - complex1.a * complex2.b) / (complex2.a * complex2.a + complex2.b * complex2.b);
return new Complex(a, b);
}
}
//测试用的类
public class ComplexTest {
public static void main(String[] args) throws Exception{
// TODO Auto-generated method stub
Complex complex1 = new Complex(1, 2);
Complex complex2 = new Complex(3, 4);
System.out.println(complex1 + " + " + complex2 + " = " + Complex.addition(complex1, complex2));
System.out.println(complex1 + " - " + complex2 + " = " + Complex.subtract(complex1, complex2));
System.out.println(complex1 + " x " + complex2 + " = " + Complex.multiplication(complex1, complex2));
System.out.println(complex1 + " / " + complex2 + " = " + Complex.division(complex1, complex2));
}
}
import java.util.*;
public class ComplexTest{
static class ComplexNumber{
private double real,image;
public ComplexNumber(){
this(0.0,0.0);}
public ComplexNumber(double a,double b){
real=a;image=b;
}
public ComplexNumber add(ComplexNumber x){
return new ComplexNumber(real+x.real,image+x.image);}
public ComplexNumber sub(ComplexNumber x){
return new ComplexNumber(real-x.real,image-x.image); }
public ComplexNumber mul(ComplexNumber x){
return new ComplexNumber(real*x.real-image*x.image,real*x.image+image*x.real);}
public ComplexNumber div(ComplexNumber x){
if(x.real==0x.image==0){
System.out.println("无法进行除法！");
return new ComplexNumber();}
else return new ComplexNumber((real*x.real+image*x.image)/(x.real*x.real+x.image*x.image)
,(image*x.real-real*x.image)/(x.real*x.real+x.image*x.image));}
public double getReal (){return real;}
public double getImage (){return image;}
public void show(){System.out.println(this.toString());}
public String toString(){
if(image0)return ""+real+image+"i";
else return ""+real+"+"+image+"i";
}
}
static class Test{
public Test(){
Scanner sr=new Scanner(System.in);
ComplexNumber a,b,c;
try{System.out.println("请输入第一个实部和虚部：");
a=new ComplexNumber(sr.nextDouble(),sr.nextDouble());
System.out.println("请输入第二个实部和虚部：");
b=new ComplexNumber(sr.nextDouble(),sr.nextDouble());
System.out.print("第一个复数：");a.show();
System.out.print("第二个复数：");b.show();
c=a.add(b);
System.out.print("两个复数的和：");c.show();
c=a.sub(b);
System.out.print("两个复数的差：");c.show();
c=a.mul(b);
System.out.print("两个复数的积：");c.show();
c=a.div(b);
System.out.print("两个复数的商：");c.show();
}
catch(InputMismatchException e){
System.out.println("输入有误！");}
}
}
public static void main(String[] args){
new Test();
}
}
public class Complex
{
private double realPart;
private double imaginaryPart;
public Complex(double a, double b)
{
this.realPart = a;
this.imaginaryPart = b;
}
public Complex add(Complex a)
{
Complex result = new Complex(this.realPart + a.realPart, this.imaginaryPart + a.imaginaryPart);//(why?)
return result;
}
public Complex decrease(Complex a)
{
Complex result = new Complex(this.realPart - a.realPart, this.imaginaryPart - a.imaginaryPart);//(why?)
return result;
}
public Complex multiply(Complex a)
{
double newReal = this.realPart*a.realPart - this.imaginaryPart * a.imaginaryPart;
double newImaginary = this.realPart*a.imaginaryPart + this.imaginaryPart * a.realPart;
Complex result = new Complex(newReal, newImaginary);
return result;
}
public Complex divide(Complex a)
{
Complex conjugate = new Complex(this.realPart, -this.imaginaryPart);
Complex multiplication = conjugate.multiply(a);
multiplication.realPart /= this.realPart*this.realPart + this.imaginaryPart * this.imaginaryPart;
multiplication.imaginaryPart /= this.realPart*this.realPart + this.imaginaryPart * this.imaginaryPart;
return multiplication;
}
public String toString()
{
String show = this.realPart + " + " + this.imaginaryPart + "i";
return show;
}
public static void main(String [] args)
{
Complex a = new Complex (2, 3);
Complex b = new Complex (1,1);
System.out.println((a.add(b)).toString());
System.out.println((a.decrease(b)).toString());
System.out.println((a.multiply(b)).toString());
System.out.println((a.divide(b)).toString());
}
}