package myapp;
import java.util.Random;
import java.util.Scanner;

import javax.swing.plaf.synth.SynthSpinnerUI;

public class Arithmetic {
	String question;
	String answer;
	
	public String getQuestion() {
		return question;
	}

	public void setQuestion(String question) {
		this.question = question;
	}

	

	public String getAnswer() {
		return answer;
	}

	public void setAnswer(String answer) {
		this.answer = answer;
	}

	static String oper1(char op,int integer,int numerator,int denominator)//整数和分数的运算 
	{
	String rst;
	if(op=='+')
	{
		return rst=((integer*denominator+numerator)+"")+'/'+(denominator+"");
	}
	if(op=='-')
	{
		return rst=((integer*denominator-numerator)+"")+'/'+(denominator+"");
	}
	if(op=='*')
	{	
		int temp=(integer*numerator);
		for(int i=2;(integer*numerator)>=i;i++) 
	    if((integer*numerator)%i==0 && denominator%i==0)
	    {
	    	
	        temp/=i;
	        denominator/=i;
	        i--;       
	    }
		return rst=(temp+"")+'/'+(denominator+"");
	}
	if(op=='÷')
	{	
		int temp= integer*denominator;
		for(int i=2;(integer*denominator)>=i;i++) 
	    if((integer*denominator)%i==0 && numerator%i==0)
	    {
	        temp/=i;
	        numerator/=i;
	        i--;       
	    }
		return rst=temp+""+'/'+numerator+"";
	}
	else
	return null;
	}
	
	static String oper2(char op,int integer1,int integer2)//整数和整数的运算 
	{
	String rst;
	if(op=='+')
	{
		return rst = (integer1 + integer2)+"";
	}
	if(op=='-')
	{
		return rst = (integer1 - integer2)+"";
	}
	if(op=='*')
	{	
		return rst = (integer1 * integer2)+"";
	}
	if(op=='÷')
	{	
		for(int i=2;integer1>=i;i++) 
	    if(integer1%i==0 && integer2%i==0)
	    {
	        integer1/=i;
	        integer2/=i;
	        i--;       
	    }
		return rst = (integer1) +"" + '/' + (integer2)+"";
	}
	else
	return null;
	} 
	
	static String oper3(char op,int numerator1,int denominator1,int numerator2,int denominator2)//分数和分数的运算 
	{
	String rst;
	int temp1,temp2;
	if(op=='+')
	{
		temp1 = numerator1 * denominator2 + numerator2 * denominator1;
		temp2 = denominator1 * denominator2;
		for(int i=2;temp1>=i;i++)  
	    if(temp1%i==0 && temp2%i==0)
	    {
	        temp1/=i;
	        temp2/=i;
	        i--;
	    }
		return rst=(temp1)+""+'/'+(temp2)+"";
	}
	if(op=='-')
	{
		temp1 = numerator1 * denominator2 - numerator2 * denominator1;
		temp2 = denominator1 * denominator2;
		for(int i=2;temp2>=i;i++) 
	    if(temp1%i==0 && temp2%i==0)
	    {
	        temp1/=i;
	        temp2/=i;
	        i--;
	    }
		return rst=(temp1)+""+'/'+(temp2)+"";
	}
	if(op=='*')
	{	
		temp1 = numerator1 * numerator2;
		temp2 = denominator1 * denominator2;
		for(int i=2;temp1>=i;i++) 
	    if(temp1%i==0 && temp2%i==0)
	    {
	        temp1/=i;
	        temp2/=i;
	        i--;
	    }
		return rst=(temp1)+""+'/'+(temp2)+"";
	}
	if(op=='÷')
	{	
		temp1 = numerator1 * denominator2;
		temp2 = denominator1 * numerator2;
		for(int i=2;temp1>=i;i++) 
	    if(temp1%i==0 && temp2%i==0)
	    {
	        temp1/=i;
	        temp2/=i;
	        i--;
	    }
		return rst=(temp1)+""+'/'+(temp2)+"";
	}
	else
	return null;
	}
	
	public static Arithmetic getArithmetic(){
		
		Arithmetic arithmetic = new Arithmetic();
		int max=20;
        int min=1;
        int n;//题目数量
    	char operation[]={'+','-','*','÷'};	//定义运算符号
    	int operand[]={1,2,3,4};//1，2为整数和整数运算；3为整数和分数运算；4为分数和分数运算；
        Random random = new Random();

        int integer1 = random.nextInt(max)%(max-min+1) + min;
        int integer2 = random.nextInt(max)%(max-min+1) + min;
        int numerator1 = random.nextInt(max)%(max-min+1) + min;
        int denominator1 = random.nextInt(max)%(max-min+1) + min;
        int numerator2 = random.nextInt(max)%(max-min+1) + min;
        int denominator2 = random.nextInt(max)%(max-min+1) + min;
        
        char tempoperation = operation[random.nextInt(4)%(4)];
        int  tempoperand = operand[random.nextInt(4)%(4)];
        String question ="";
        String answer = "";
        if(tempoperand == 1 || tempoperand == 2){//整数和整数
        	
        	question = integer1+""+tempoperation+integer2+"=";
        	answer = oper2(tempoperation,integer1,integer2);
        } 
        if(tempoperand == 3){	//整数和分数
        	question = integer1+""+ tempoperation + numerator1+"/"+denominator1+"=";
        	answer = oper1(tempoperation,integer1,numerator1,denominator1);
        }
        if(tempoperand == 4){	//分数和分数
        	question = numerator1+"/"+denominator1 + "" + tempoperation + numerator2+"/"+denominator2+"=";
        	answer = oper3(tempoperation,numerator1,denominator1,numerator2,denominator2);
        }
        arithmetic.question=question;
        arithmetic.answer = answer;
		return arithmetic;
}
	
	
	@Override
	public String toString() {
		return  question  + answer ;
	}

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