6-18 分数计算pta

该题目实现了分数的表示，分数的加法和乘法。该题目的输入不需要考虑输入分母为“0”。注意，例如当输入是分子是4，分母是8的时候，分数应该是1/2，而不是4/8.

import java.util.Scanner;

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).print();
        in.close();
    }
}

/* 请在这里填写答案 */

class Fraction
	    {
	    	int a, b;
	    	
	    	Fraction(int x, int y)
	    	{
	    		this.a = x;
	    		this.b = y;	
	    	}

	    	Fraction plus(Fraction x)
	    	{
	    		Fraction r = new Fraction(0,0);
	    		r.a =this.a * x.b + this.b * x.a;//fenzi
	    		r.b =this.b * x.b;//fenmu
	    		return r;
	    	}
	    	
	    	Fraction multiply(Fraction x) 
	    	{
	    		this.a = this.a * x.a;
	    		this.b = this.b * x.b;
	    		return this;
	    	}
	    	void print() 
	    	{
	    		int h ;
	    		 if(this.a > this.b )
	    		 {
	    			  h = GCD(this.a, this.b) ;
	    		 }
	    		 else
	    		 {
	    			 h = GCD(this.b, this.a);
	    		 }
	    		this.a /= h;
	    		this.b /= h;
	    		System.out.print(this.a+"/"+this.b+' ');
	    	}
	    	
	    	public  int GCD(int x,int y)
	    	{
	    		if(x %y == 0) return y;
	    		return GCD(y, x % y);
	    	}
	    }