如何将小数转换为分数? [英] How to convert decimal to fractions?

问题描述

我需要将小数转换为分数.转换成10英尺很容易.

What I need to convert decimal to fractions. It is easy to convert to 10's feet.

1.5 => 15/10

这可以通过以下代码完成:

This can do via this code:

public class Rational {

    private int num, denom;

    public Rational(double d) {
        String s = String.valueOf(d);
        int digitsDec = s.length() - 1 - s.indexOf('.');
        int denom = 1;
        for (int i = 0; i < digitsDec; i++) {
            d *= 10;    
            denom *= 10;
        }

        int num = (int) Math.round(d);
        this.num = num;
        this.denom = denom;
    }

    public Rational(int num, int denom) {
        this.num = num;
        this.denom = denom;
    }

    public String toString() {
        return String.valueOf(num) + "/" + String.valueOf(denom);
    }

    public static void main(String[] args) {
        System.out.println(new Rational(1.5));
    }
}

但是我想要的是

1.5 => 3/2

，我不知道如何进行. 我的问题不是重复.因为其他相关问题是C#.这是java.

and I don't get how to proceed. My question is not a duplication. Because other related question is C#. This is java.

推荐答案

您应该找到结果数字的最大公约数，并将分子和分母除以它.

You should find the greatest common divisor of the resulted numbers and divide the numerator and denominator by it.

这是一种实现方法:

public class Rational {

    private int num, denom;

    public Rational(double d) {
        String s = String.valueOf(d);
        int digitsDec = s.length() - 1 - s.indexOf('.');
        int denom = 1;
        for (int i = 0; i < digitsDec; i++) {
            d *= 10;    
            denom *= 10;
        }

        int num = (int) Math.round(d);
        int g = gcd(num, denom);
        this.num = num / g;
        this.denom = denom /g;
    }

    public Rational(int num, int denom) {
        this.num = num;
        this.denom = denom;
    }

    public String toString() {
        return String.valueOf(num) + "/" + String.valueOf(denom);
    }

    public static int gcd(int num, int denom) {
          ....
    }

    public static void main(String[] args) {
        System.out.println(new Rational(1.5));
    }
}

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