用java实现复数的加减乘除运算(改进第1次)
用java实现复数的加减乘除运算(改进第1次)
前两天为了赶速度，自己很快实现了如题java老师布置的作业，并在csdn上写了博客，记录学习过程，原博客链接为:http://blog.csdn.net/u010043538/article/details/12765527。但是很快有无私的网友指出了其中一个显然的错误：没有考虑除数为0的情况。虽然java初学，不过错就是错，没有啥理由。自己以后写老师作业，会尽可能深进去，把已经自学过的内容体现出来，而不是跟老师上课的内容来写代码。在此基础上，尽可能保证快速解决问题。
此次改进修正了错误：没有考虑除数为0的情况。并对程序的封装性做了一定程度的改进。
package Four;/** * @author Kun Sun * @Date： 2013.10.17 */public class Complex { // 复数类double real; // 实部double image; // 虚部Complex(double real,double image){ // 带参数的构造方法this.real = real;this.image = image;}public Complex() {// TODO Auto-generated constructor stub}public double getReal() {return real;}public void setReal(double real) {this.real = real;}public double getImage() {return image;}public void setImage(double image) {this.image = image;}Complex add(Complex a){ // 复数相加double real2 = a.getReal();double image2 = a.getImage();double newReal = real + real2;double newImage = image + image2;Complex result = new Complex(newReal,newImage);return result;}Complex sub(Complex a){ // 复数相减double real2 = a.getReal();double image2 = a.getImage();double newReal = real - real2;double newImage = image - image2;Complex result = new Complex(newReal,newImage);return result;}Complex mul(Complex a){ // 复数相乘double real2 = a.getReal();double image2 = a.getImage();double newReal = real*real2 - image*image2;double newImage = image*real2 + real*image2;Complex result = new Complex(newReal,newImage);return result;}Complex div(Complex a){ // 复数相除double real2 = a.getReal();double image2 = a.getImage(); double newReal = (real*real2 + image*image2)/(real2*real2 + image2*image2);double newImage = (image*real2 - real*image2)/(real2*real2 + image2*image2);Complex result = new Complex(newReal,newImage);return result;}public void print(){ // 用于格式化输出if(image > 0){System.out.println(real + " + " + image + "i");}else if(image < 0){System.out.println(real + "" + image + "i");}else{System.out.println(real);}}// 封装了具体运算，主要为对输入进行转换，对输出封装public static void talk(String data1_1,String data1_2,String data2_1,String data2_2,String operation){ // 以下语句为格式转换 double dat1_1 = Double.parseDouble(data1_1); // 把string型实部转为double型double dat1_2 = Double.parseDouble(data1_2.substring(0,data1_2.length()-1));// 把去除"i"的string型虚部转为double型double dat2_1 = Double.parseDouble(data2_1);// 把string型实部转为double型double dat2_2 = Double.parseDouble(data2_2.substring(0,data2_2.length()-1));// 把去除"i"的string型虚部转为double型Complex num1 = new Complex(dat1_1,dat1_2);Complex num2 = new Complex(dat2_1,dat2_2);Complex result;int a,b;if(operation.equals("+")){ // 两数相加 result = num1.add(num2); result.print();}if(operation.equals("-")){ // 两数相减 result = num1.sub(num2);result.print();}if(operation.equals("*")){ // 两数相乘 result = num1.mul(num2);result.print();}if(operation.equals("/")){ // 两数相除if(num2.real * num2.real + num2.image*num2.image != 0){ result = num1.div(num2); result.print();}else{System.out.println("运算出错,除数运算中除数不能为0,请用户重新输入!");}}}}package Four;import java.util.Scanner;/** * @author Kun Sun * @Date： 2013.10.17 */public class MainClass { // 用于测试复数类/** * @param args */public static void main(String[] args) {// TODO Auto-generated method stubComplex complex = new Complex();// 以下测试中的talk()中的解释为// talk(string data1_1,string data1_2,string data2_1,string data2_2,string operation);// data1_1,data1_2依次为第一个复数的实部和虚部// data2_1,data2_2依次为第二个复数的实部和虚部// operation为两个复数运算的操作符,每种测试都做加减乘除System.out.println("测试1:-------------------------"); // 一般测试complex.talk("5", "4i", "3", "6i", "+");complex.talk("5", "4i", "3", "6i", "-");complex.talk("5", "4i", "3", "6i", "*");complex.talk("5", "4i", "3", "6i", "/");System.out.println("\n测试2:-------------------------"); // 包含负数测试 complex.talk("-2","4i", "5", "-8i","+"); complex.talk("-2","4i", "5", "-8i","-"); complex.talk("-2","4i", "5", "-8i","*"); complex.talk("-2","4i", "5", "-8i","/"); System.out.println("\n测试3:-------------------------"); // 包含小数测试 complex.talk("-1.2","3.1i","4.3","-6.5i","+"); complex.talk("-1.2","3.1i","4.3","-6.5i","-"); complex.talk("-1.2","3.1i","4.3","-6.5i","*"); complex.talk("-1.2","3.1i","4.3","-6.5i","/"); System.out.println("\n测试4:-------------------------"); // 包含除数为0测试 complex.talk("5", "4i", "0", "0i", "+"); complex.talk("5", "4i", "0", "0i", "-"); complex.talk("5", "4i", "0", "0i", "*"); complex.talk("5", "4i", "0", "0i", "/");}}