Question

我必须编写一个代码来定义复杂数字的基本数学运算。我创建了一个类来定义如何执行这些操作，并创建一个测试类来运行代码。

以下是定义操作的代码：

import java.util.Scanner;

public class ComplexNumber{

    float real;
    float imaginary;
    private float a;
    private float b;

public ComplexNumber(float a, float b){
    real = a;
    imaginary = b;
}

public ComplexNumber add(ComplexNumber otherNumber){
    ComplexNumber newComplex;
    float newA = a + otherNumber.getA();
    float newB = b + otherNumber.getB();
    newComplex = new ComplexNumber(newA, newB);
    return newComplex;
}

public ComplexNumber minus(ComplexNumber otherNumber){
    ComplexNumber newComplex;
    float newA = a - otherNumber.getA();
    float newB = b - otherNumber.getB();
    newComplex = new ComplexNumber(newA, newB);
    return newComplex;
}

public ComplexNumber times(ComplexNumber otherNumber){
    ComplexNumber newComplex;
    float newA = (a * otherNumber.getA()) - (b * otherNumber.getB());
    float newB = (b * otherNumber.getB()) - (a * otherNumber.getA());
    newComplex = new ComplexNumber(newA, newB);
    return newComplex;
}

public ComplexNumber divide(ComplexNumber otherNumber){
    ComplexNumber newComplex;
    float newA = (a * otherNumber.getA()) + (b*otherNumber.getB());
    float newB = (otherNumber.getA() * otherNumber.getA()) + (otherNumber.getB() * otherNumber.getB());
    float newC = (b * otherNumber.getA()) + (a * otherNumber.getB());
    float newD = (otherNumber.getA() * otherNumber.getA()) + (otherNumber.getB() * otherNumber.getB()); 
    float firstFraction = (newA / newB);
    float secondFraction = (newC / newD);
    newComplex = new ComplexNumber(firstFraction, secondFraction);
    return newComplex;      
}

public float getA(){
    return a;
}

public float getB(){
    return b;
}

public String toString(){
    return a + " + " + b + "i";
 }
}

这是我的测试课程：

import java.util.Scanner;

class ComplexCalculator{
public static void main(String[] args){
    Scanner myScanner = new Scanner(System.in);
    float tempA, tempB, tempC, tempD;
    ComplexNumber first, second, result;

    System.out.println("Choose an operation: \n1. Addition \n2. Subtraction \n3. Multiplication \n4. Division \n5. Quit");
    int selection = myScanner.nextInt();

    if (selection == 1) {
        System.out.println("Enter A: ");
        tempA = myScanner.nextFloat();
        System.out.println("Enter B: ");
        tempB = myScanner.nextFloat();
        System.out.println("Enter C: ");
        tempC = myScanner.nextFloat();
        System.out.println("Enter D: ");
        tempD = myScanner.nextFloat();

        first = new ComplexNumber(tempA, tempB);
        second = new ComplexNumber(tempC, tempD);
        result = first.add(second);
        System.out.println(result.toString());
    }

    if (selection == 2) {
        System.out.println("Enter A: ");
        tempA = myScanner.nextFloat();
        System.out.println("Enter B: ");
        tempB = myScanner.nextFloat();
        System.out.println("Enter C: ");
        tempC = myScanner.nextFloat();
        System.out.println("Enter D: ");
        tempD = myScanner.nextFloat();

        first = new ComplexNumber(tempA, tempB);
        second = new ComplexNumber(tempC, tempD);
        result = first.minus(second);
        System.out.println(result.toString());
    }

    if (selection == 3) {
        System.out.println("Enter A: ");
        tempA = myScanner.nextFloat();
        System.out.println("Enter B: ");
        tempB = myScanner.nextFloat();
        System.out.println("Enter C: ");
        tempC = myScanner.nextFloat();
        System.out.println("Enter D: ");
        tempD = myScanner.nextFloat();

        first = new ComplexNumber(tempA, tempB);
        second = new ComplexNumber(tempC, tempD);
        result = first.times(second);
        System.out.println(result.toString());
    }

    if (selection == 4) {
        System.out.println("Enter A: ");
        tempA = myScanner.nextFloat();
        System.out.println("Enter B: ");
        tempB = myScanner.nextFloat();
        System.out.println("Enter C: ");
        tempC = myScanner.nextFloat();
        System.out.println("Enter D: ");
        tempD = myScanner.nextFloat();

        first = new ComplexNumber(tempA, tempB);
        second = new ComplexNumber(tempC, tempD);
        result = first.divide(second);
        System.out.println(result.toString());
    }

    if (selection == 5){
        System.out.println("Thank you!");
        return;
    }

}
}

每当我运行我的代码时，我会输入四个数字，但它总是打印出来0.0 + 0.0i。

Answer 1

当您指定了两个成员

时，会出现此问题

private float a;
private float b;

，您的toString()定义为

public String toString(){
    return a + " + " + b + "i";
}

然而，您的代码中没有任何地方设置a或b。

尝试使用real和imaginary替换a和b。

编译器打印错误答案 - Java

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