四则运算测试与封装5.2 5.3 结对

开发环境：eclipse

结对同伴 ：王逸辉

同伴博客：http://www.cnblogs.com/wyh624945780/

程序代码：

import java.util.Random;

public class JiS {

 private char[] ch = new char[] { '+', '-', '*', '/' };

 private int a;

 private int b;

 private int e;

 private int d;

 private char c;

 private String[]str=new String[10];

 private String[]stb=new String[10];

 private String ss="";

 private String sb="";

    public JiS(){

     

    }

 public String tiM(int a,int b,int e,int d){

  Random r = new Random();

  boolean flag = true;

  while (flag) {

    //  a=(int) (Math.random()*200-100);

      //a=10000;

      //b=(int) (Math.random()*200-100);

      //e=(int) (Math.random()*200-100);

      //d=(int) (Math.random()*200-100);

      try{

          if(a>1000||a<-1000||b>1000||b<-1000||e>1000||e<-1000||d>1000||d<-1000)

          {

              throw new YC();  

          }

          

      }catch(YC z)

      {

         z.fw(); 

      }



    c = ch[r.nextInt(ch.length)];

   // System.out.println(a+","+b+","+c);

   

    switch (c) {

    case '+':

    try{

      if(a>1000||a<-1000||b>1000||b<-1000||e>1000||e<-1000||d>1000||d<-1000)

            {

          

          throw new YC();

            }

            }

          catch(YC z)

            {

                z.fw();

            }

    if (a + b <= 10000) 

    {

   ss=a + "+" + b + "=" + (a + b);

   sb=b + "+" + a + "=" + (a + b);

   flag = false;

    }

     break;

    case '-':

     if (a - b >= 0) {

      ss=a + "-" + b + "=" + (a - b);

      sb=ss;

      flag = false;

     }

     break;

    case '*':

     if (a * b <= 10000) {

      ss=a + "*" + b + "=" + a * b;

      sb=b + "*" + a + "=" + a * b;

      flag = false;

     }

     break;

    case '/':

     if (b != 0) {

      ss=a + "/" + b + "=" + a / b;

      sb=ss;

      flag = false;

     }

     break;

    }

  }

  return ss;

 }

 public void tiS(){

  loop:for(int i=0;i<10;i++){

   tiM(a,b,e,d);

   str[i]=ss;

   stb[i]=sb;

   ss="";

   sb="";

   for(int j=0;j<i;j++){

    if(str[j]==str[i]||str[j]==stb[i]){i--;continue loop;}

   }

   System.out.println("第"+(i+1)+"题:"+str[i]);

  }

 }

 public static void main(String[] args) {

  JiS js=new JiS();

  js.tiS();

  }

}

import java.util.*;

public class YC extends Exception{

    public void chuling()

    {

        System.out.printf("分母不能为零！");

    }

    public void fw()

    {

        System.out.print("数值超出范围！");

    }

}

 测试代码：

import static org.junit.Assert.*;



import org.junit.Test;





public class JiSTest {



    @Test

    public void testTiM() throws Error {

        JiS jis=new JiS();

        String result=jis.tiM(10, 8, 5,2);

        assertEquals(3,result);

        //fail("Not yet implemented");

    }



}

 

异常调试：

一开始我们弄数值大一点，显示超出数值提示。

 心得与体会：

 这次的程序测试比想象的难，通过和结对队友的共同努力，加上我们研究网上的例子，终于搞定了。