java练习(分数相乘相加)

分数相乘相加

import java.util.Scanner;

class Fraction{

int a;
int b;

public Fraction() {
    }

public Fraction(int a,  int b) {
this.a = a;
this.b = b;
    }

public double toDouble(){
//整数相除要想转化为小数需要将其中一个（除数或者被除数*1.0）
double temp = a*1.0/b;
return temp;
    }

public void print(){
//分数在输出的时候进行化简
int temp = GCD(this.a, this.b);
this.a = this.a / temp;
this.b = this.b / temp;
if(a == b && a == 1){
            System.out.println("1");
        }else{
            System.out.println(a+"/"+b);
        }
    }
public Fraction multiply(Fraction r){
// 将自己的分数与r的分数相乘并返回值
        Fraction temp = new Fraction((this.a*r.a), (this.b*r.b));
return temp;
    }
private int GCD(int a, int b){
//辗转相除法求最大公约数
int temp;
if(a < b){
            temp = a;
            a = b;
            b = temp;
        }
while(b!=0){
            temp = b;
            b = a%b;
            a = temp;
        }
return a; 
    }
public Fraction plus(Fraction r){
// 将自己的分数与r的分数相加并返回值
/*
 * 先通分再相加
 * 求出this.a与r.a之间的最小公倍数
 * 之后this.b*(temp/this.a) + r.b*(temp/r.a)
 * 之后返回
 */
        Fraction temp = new Fraction();
        temp.b = this.b * r.b;
        temp.b = temp.b/GCD(this.b, r.b);
        temp.a = (this.a*(temp.b/this.b) + r.a*(temp.b/r.b));
return temp;
    }
}

public class Main {

public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        Fraction a = new Fraction(in.nextInt(), in.nextInt());
        Fraction b = new Fraction(in.nextInt(),in.nextInt());
        a.print();
        b.print();
        a.plus(b).print();
        a.multiply(b).plus(new Fraction(5, 6)).print();
        a.print();
        b.print();
        in.close();
    }

}