软件工程个人作业01

一个能自动生成三十道小学四则运算题目的 “软件”，要求：除了整数以外，还要支持真分数的四则运算（需要验证结果的正确性）、题目避免重复、可定制出题的数量。

程序的设计思想：

将整数四则运算和分数四则运算分别写成一个类，然后在测试类中利用了随机数数生成0和1分别调用两个类，在控制台输出题目。

序代源程码：

package cal;

import java.util.Random;
import java.util.Scanner;

 class jis {
     public static int flag=0;
     public void show1()
    {
        
        double right = 0;
        double wrong = 0;
        for (int i = 0; i < 10; i++) {
            System.out.println("第"+(i+1)+"道题,请在下方输入答案：");


            //生成两个随机数
            Random r1 = new Random();
            int x = r1.nextInt(100)+1;
            Random r2 = new Random();
            int y = r2.nextInt(100)+1;
            //生成随机运算符    + - * /
            Random r3 = new Random();
            int z = r3.nextInt(4);
            char[] chs = {'+','-','*','/'};
            String Operator = String.valueOf(chs[z]);

            //生成题目
            if(Operator.equals("+")){
                System.out.println(x+"+"+y+"=");
                boolean b = add(x,y);
                if(b == true){
                    right++;
                    System.out.println("bingo! ");
                }else{
                    wrong++;
                    System.out.println("oh~no ");
                }
                System.out.println("the right answer: "+(x+y));

            }else if(Operator.equals("-")){
                System.out.println(x+"-"+y+"=");
                boolean b =minus(x,y);
                if(b == true){
                    right++;System.out.println("bingo! ");
                }else{
                    wrong++;System.out.println("oh~no ");
                }
                System.out.println("the right answer: "+(x-y));

            }else if(Operator.equals("*")){
                System.out.println(x+"×"+y+"=");
                boolean b =times(x,y);
                if(b == true){
                    right++;System.out.println("bingo! ");
                }else{
                    wrong++;System.out.println("oh~no ");
                }
                System.out.println("the right answer: "+(x*y));
            }else{
                System.out.println(x+"÷"+y+"=");
                boolean b =divide(x,y);
                if(b == true&&flag==0){
                    right++;System.out.println("bingo! ");
                }
                else if(b == false&&flag==0)
                {
                    wrong++;System.out.println("oh~no ");
                }  
                System.out.println("the right answer: "+((float)x /(float) y));
            }
            System.out.println("-------------------------------");
        }
        System.out.println("您一共做对了"+right+"道题.");
        System.out.println("您一共做错了"+wrong+"道题.");
        if(wrong > 0){
            System.out.println("正确率为"+(right/(wrong+right))*100+"%");
        }else{
            System.out.println("Unbelievable!");
        }
    }

    private static boolean add(int x,int y) {
        // TODO Auto-generated method stub
        Scanner sc = new Scanner(System.in);
        int num1 = sc.nextInt();
        int result = x + y;
        if(num1 == result){
            return true;
        }else{
            return false;
        }

    }
    private static boolean minus(int x,int y) {
        // TODO Auto-generated method stub
        if(x<y)
        {
            int t=x;
            x=y;
            y=t;
        }
        Scanner sc = new Scanner(System.in);
        int num1 = sc.nextInt();
        int result = x - y;
        if(num1 == result){
            return true;
        }else{
            return false;
        }

    }
    private static boolean times (int x,int y) {
        // TODO Auto-generated method stub
        Scanner sc = new Scanner(System.in);
        int num1 = sc.nextInt();
        int result = x * y;
        if(num1 == result){
            return true;
        }else{
            return false;
        }

    }
    private static boolean divide(int x,int y) {
        // TODO Auto-generated method stub
        Scanner sc = new Scanner(System.in);
        int  num1 = sc.nextInt();
        if(x%y==0)
        {
            int  result =x/y;
            if(num1==result)
            {
                return true;
            }
            else
            {
                return false;
            }
        }
        else 
        {
            flag=1;
        }
    
        return true;
        
            

    }
}

package cal;

import java.util.Random;
import java.util.Scanner;

 class demojisuan { 
    public static String s1="";
    public static String s2="";
    public static String s3="";
    public static String s4="";
    
   public void show2()
   {
       double right = 0;
        double wrong = 0;
        
        for(int i=0;i<10;i++)
        {
            System.out.println("第"+(i+1)+"道题,请在下方输入答案：");
       Random r1 = new Random();
        int x1 = r1.nextInt(10)+1;
        int x2 = r1.nextInt(10)+1;
        Random r2 = new Random();
        int y1 = r2.nextInt(10)+1;
        int y2 = r2.nextInt(10)+1;
        //生成随机运算符    + - * /
        Random r3 = new Random();
        int z = r3.nextInt(4);
        char[] chs = {'+','-','*','/'};
        String Operator = String.valueOf(chs[z]);
        //生成题目
        if(Operator.equals("+")){
            System.out.println(x1+"/"+y1+"+"+x2+"/"+y2+"=");
            boolean b = fracAdd(x1,y1,x2,y2);
            if(b == true){
                right++;
                System.out.println("bingo! ");
            }else{
                wrong++;
                System.out.println("oh~no ");
            }
            System.out.println("the right answer: "+s1);
        }
        else if(Operator.equals("-")){
            System.out.println(x1+"/"+y1+"-"+x2+"/"+y2+"=");
            boolean b = fracSub(x1,y1,x2,y2);
            if(b == true){
                right++;System.out.println("bingo! ");
            }else{
                wrong++;System.out.println("oh~no ");
            }
            System.out.println("the right answer: "+s2);

        }else if(Operator.equals("*")){
            System.out.println(x1+"/"+y1+"*"+x2+"/"+y2+"=");
            boolean b =fracMul(x1,y1,x2,y2);
            if(b == true){
                right++;System.out.println("bingo! ");
            }else{
                wrong++;System.out.println("oh~no ");
            }
            System.out.println("the right answer: "+s3);
        }else{
            System.out.println(x1+"/"+y1+"/"+x2+"/"+y2+"=");
            boolean b =fractDiv(x1,y1,x2,y2);
            if(b == true){
                right++;System.out.println("bingo! ");
            }else{
                wrong++;System.out.println("oh~no ");
            }  
            System.out.println("the right answer: "+s4);
        }
        System.out.println("-------------------------------");
        }
   System.out.println("您一共做对了"+right+"道题.");
    System.out.println("您一共做错了"+wrong+"道题.");
    if(wrong > 0){
        System.out.println("正确率为"+(right/(wrong+right))*100+"%");
    }else{
        System.out.println("Unbelievable!");
    }
 
   }  
   static boolean fracAdd(int first_numerator,int first_denominator,int second_numrator,int second_denominator){  
       //以下代码能够在控制台上显示结果  
       //需要调用求最大公约数的函数  
       //需要调用求最小公倍数的函数  
       int denominator;  
       int numerator;  
         
       if(first_denominator==second_denominator)  //分母相同时加分子       
       {        
            denominator=first_denominator;        
            numerator=first_numerator+second_numrator;        
       }        
       else  //否则同分比较分子       
       {        
           denominator=first_denominator*second_denominator;        
           numerator=first_numerator*second_denominator+first_denominator*second_numrator;        
       }      
       int gcd = gcd(numerator,denominator);  
       denominator = denominator / gcd;  
       numerator = numerator / gcd;          
       Scanner sc = new Scanner(System.in);
        String num1 = sc.next();
        String result = numerator+"/"+denominator;
        s1=result;
        if(num1.equals(result)){
            return true;
        }else{
            return false;
        }         
 
   }  
   static boolean fracSub(int first_numerator,int first_denominator,int second_numrator,int second_denominator){  
       //以下代码能够在控制台上显示结果  
       //需要调用求最大公约数的函数  
         
       int denominator;  
       int numerator;  
         
       if(first_denominator==second_denominator)  //分母相同时加分子       
       {        
            denominator=first_denominator;        
            numerator=first_numerator-second_numrator;        
       }        
       else  //否则同分比较分子       
       {        
           denominator=first_denominator*second_denominator;        
           numerator=first_numerator*second_denominator-first_denominator*second_numrator;        
       }      
       int gcd = gcd(numerator,denominator);  
       denominator = denominator / gcd;  
       numerator = numerator / gcd;   
       Scanner sc = new Scanner(System.in);
        String num1 = sc.next();
        String result = numerator+"/"+denominator;
        s2=result;
        if(num1.equals(result)){
            return true;
        }else{
            return false;
        }    
 
   }  
   static boolean fracMul(int first_numerator,int first_denominator,int second_numerator,int second_denominator){  
       //以下代码能够在控制台上显示结果  
       //需要调用求最大公约数的函数  
         
       int denominator;  
       int numerator;  
         
        
           denominator=first_denominator*second_denominator;        
           numerator=first_numerator*second_numerator;   
           
       int gcd = gcd(numerator,denominator);  
       denominator = denominator / gcd;  
       numerator = numerator / gcd;          
       Scanner sc = new Scanner(System.in);
        String num1 = sc.next();
        String result = numerator+"/"+denominator;
        s3=result;
        if(num1.equals(result)){
            return true;
        }else{
            return false;
        }        
 
   }  
   static boolean fractDiv(int first_numerator,int first_denominator,int second_numerator,int second_denominator){  
       //以下代码能够在控制台上显示结果  
       //需要调用求最大公约数的函数  
         
       int denominator;  
       int numerator;  
         
       numerator = first_numerator*second_denominator;  
       denominator = first_denominator*second_numerator;  
         
             
           
       int gcd = gcd(numerator,denominator);  
       denominator = denominator / gcd;  
       numerator = numerator / gcd;          
       Scanner sc = new Scanner(System.in);
        String num1 = sc.next();
        String result = numerator+"/"+denominator;
        s4=result;
        if(num1.equals(result)){
            return true;
        }else{
            return false;
        }          
 
   }  
   static int gcd(int x,int y){  //最大公约数
        int r;        
           while( y!= 0)        
           {        
               r = x%y;        
               x = y;        
               y = r;        
           }        
 
       return x;  
}  
   
}

package cal;

public class Test {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        jis jis=new jis();
        jis.show1();
        demojisuan jisuan=new demojisuan();
        jisuan.show2();
    }
}

运行结果截图：