四则运算器初步成果小结

目前四则运算程序已经完成了整数之间的加减乘除，随机生成题目，用户输入并判断答案对错。下一步，实现分数之间的出题。fighting。。。。（然而我不会发代码，233333，只能贴图了）

package software;

public class fraction {
      private int numerator;
      private int denominator;
      public fraction(int numerator, int denominator){
        this.numerator=numerator;
        this.denominator=denominator;
      }
      public double getRet(){
        return (double)numerator/denominator;
      }
      public String toString(){
        return numerator+"/"+denominator;
      }
}

这个类是从网上搞的一个现成的分数类。下面的都是自己的实现过程：

package software;

import java.util.Scanner;
import java.math.*; 

public class jisuan {
    public char operate(){
        int i;
        char op = ' ';
        i=(int)(Math.random()*100)%4+1;
        switch(i){
        case 1:op='+';break;
        case 2:op='-';break;
        case 3:op='*';break;
        case 4:op='/';
        }
        return op;    
    }
     
    public int num(){
        int i;
        i=(int)(Math.random()*100)+1;
        return i;
    }
    
    public int maxyueshu( int a, int b ){
        return a%b==0?b:maxyueshu(b,a%b);     
    }
    
    public String calculate(int a,char op,int b){
        if(op=='+')
            return (a+b)+"";
        else if(op=='-')
            return (a-b)+"";
        else if(op=='*')
            return (a*b)+"";
        else{
            int max=this.maxyueshu(a, b);
            a=a/max;
            b=b/max;
            if(b==1){
                return a+"";
            }
            else{
                fraction t=new fraction(a,b);
                String tt=t.toString();
                return tt;
            }
        }           
    }
    
    public void intmatch(){
        int a=this.num();
        int b=this.num();
        char op=this.operate();
        int answer;
        String myanswer;
        System.out.print("请做题："+a+op+b+"=");
        String answer1=this.calculate(a, op, b);
        //System.out.print(answer1);
        Scanner in= new Scanner(System.in); 
        myanswer=in.next();
        if(myanswer.equals(answer1)){
            System.out.print("恭喜，答案正确。");
        }
        else{
            System.out.print("很抱歉，答案错误。正确答案为："+answer1);
        }
    }

    public void frcmatch(){
        
    }
    public static void main(String[] args) {
        jisuan a=new jisuan();
        a.intmatch();
        // TODO Auto-generated method stub

    }

}