java - 有理类 - 无法约简分数和除法

Question

我的 Rational 类应该进行分数加、减、乘和除操作，因此当在主类中调用时，它将执行这些操作。但是，我似乎无法正确减少我的分数(gcd)以获得正确的答案，并且除法方法根本没有运行(我收到一条错误消息):

线程“main”中的异常 java.lang.ArithmeticException:/为零 在 Rational.division(Project1.java:45) 在 Project1.main(Project1.java:12)

如何解决这些问题？谢谢

公共(public)类项目1{

public static void main(String[] args) {

    Rational a = new Rational (6, 12);
    Rational b = new Rational (8, 9);

    System.out.println(a + " + " + b + " = " + a.add(b));
    System.out.println(a + " - " + b + " = " + a.subtraction(b));
    System.out.println(a + " * " + b + " = " + a.multiply(b));
    System.out.println(a + " / " + b + " = " + a.division(b));
}

}

理性类{

private int numerator, denominator;

public Rational(int num, int denom) {
    numerator = num;
    denominator = denom;
}
public Rational gcd() {
    while (numerator != denominator)
    {
        if (numerator > denominator)
            numerator = numerator - denominator;
        else
            denominator = denominator - numerator;
    }
    return new Rational(numerator, denominator);
}

public Rational add(Rational o) {
    return new Rational (numerator + o.numerator, denominator +o.denominator);
}

public Rational conjugate() {
    return new Rational (numerator, - denominator);
}

public Rational division(Rational o) {
    return new Rational ((numerator/denominator) / (numerator/denominator), denominator);
}

public Rational multiply(Rational o) {
    return new Rational (numerator * o.numerator, denominator * o.denominator);
}

public Rational subtraction(Rational o) {
    return new Rational (numerator - o.numerator, denominator - o.denominator);
}

public String toString() {
    return (numerator + "/" + denominator);
}

}

Answer 1

您遇到的问题在这里:

public Rational division(Rational o) {
    return new Rational ((numerator/denominator) / (numerator/denominator), denominator);
}

当您运行代码时，您会执行以下操作:

(6/12)/(6/12)

括号中的 (6/12) 都向下转换为 0，因此最终会下降 0，这是不允许的。

我建议使用 System.out.println() 调试代码以查看哪里出错了。但错误非常明显，你除以 0。