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。