Question

我的Rational Class应该对分数进行加，减，乘和除，所以当在Main Class中调用时，它将执行这些操作。但是，我似乎无法正确地减少我的分数（gcd）以获得正确答案，并且除法方法根本没有运行（我收到错误消息）：

线程中的异常＆＃34; main＆＃34; java.lang.ArithmeticException：/ by零在Rational.division（Project1.java:45）在Project1.main（Project1.java:12）

我该如何解决这些问题？感谢

公共类Project1 {

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));
}

}

类Rational {

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

你遇到的问题是：

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

运行代码时，您可以：

(6/12)/(6/12)

方括号中的两个（6/12）都被下调到0，因此你最终潜水0，这是不允许的。

我建议使用System.out.println（）调试代码以查看出错的地方。但错误很明显，你要除以0。

Answer 2

我会改变你的除法中的逻辑。你甚至不需要除以计算分数，这将避免你除以零的情况。相反，我会这样做来划分两个分数：

return new Rational (numerator * o.denominator, o.numerator * denominator);

另外，我并没有真正遵循GCD功能中的逻辑，因为我猜这会导致你无限循环。如果你需要帮助，请查看Euclid的算法。

Answer 3

private int numerator，denominator; //此值为0

与

中使用的相同

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

而不是object o

理性类 - 无法减少分数并除以

3 个答案: