两分数的加减乘除

/**
 * 分数的加、减、乘、除
 * 
 * @author 王启文
 *
 */

public class Private {
    private double member;
    private double denominator;

    public Private(double member, double denominator) {
        this.member = member;
        this.denominator = denominator;
    }

    public double addition(Private other) {
        double a = 0;
        a = (member * other.denominator + denominator * other.member)
                / (denominator * other.denominator);
        return a;
    }

    public double subtraction(Private other) {
        double a = 0;
        a = (member * other.denominator - denominator * other.member)
                / (denominator * other.denominator);
        return a;
    }

    public double multiplication(Private other) {
        double a = 0;
        a = member * other.member / (denominator * other.denominator);
        return a;
    }

    public double division(Private other) {
        double a = 0;
        a = member * other.denominator / (denominator * other.member);
        return a;
    }
}

import java.util.Scanner;

/**
 * 对两个分数的运算
 * 
 * @author 王启文
 *
 */

public class p1 {
    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);
        System.out.println("请输入第一个分数的分子、分母：");
        int a = sc.nextInt();
        int b = sc.nextInt();
        System.out.println("请输入第二个分数的分子、分母：");
        int c = sc.nextInt();
        int d = sc.nextInt();
        Private a1 = new Private(a, b);
        Private a2 = new Private(c, d);

        System.out.println(a + "/" + b + "+" + c + "/" + d + "="
                + a1.addition(a2));
        System.out.println(a + "/" + b + "-" + c + "/" + d + "="
                + a1.subtraction(a2));
        System.out.println(a + "/" + b + "*" + c + "/" + d + "="
                + a1.multiplication(a2));
        System.out.println(a + "/" + b + "/" + "(" + c + "/" + d + ")" + "="
                + a1.division(a2));

        sc.close();
    }
}