计算与软件工程作业二

作业一

简易四则运算结果

package calc;

/*支持分数和随机长度，并可以将每次答题情况记录到文件里 */

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.PrintStream;
import java.util.Date;
import java.util.Scanner;

public class Question {

 public static String str = "";//题目
 public static int num = 4;//每题中数的个数
 public static int num_i = 0;//题目中已有数的个数    
 public static int numberRange = 20;//运算中数的最大取值    
 public static number sum = new number();//结果
 
 public static void main(String[] args) {
     
     System.out.println();
     System.out.println("Please finish the following 25 questions!");
     System.out.println("Note: don't seperate your answer with space, ");
     System.out.println("or you will be considered wrong!");
     System.out.println();
     
     Scanner input=new Scanner(System.in);
     
     String file="out.txt";
     
     int right=0;
     PrintStream out = null;  
     
     
     if(args.length>=1)
         file=args[0];
     
     try {
         out=new PrintStream(new FileOutputStream(file));
     } catch (FileNotFoundException e1) {
         // TODO Auto-generated catch block
         e1.printStackTrace();
         input.close();
         return ;
     }
     
     out.println("

"+new Date()+"

");

     for (int i = 0; i < 25; i++) {
         
         GetQuestion();
         System.out.print(i+1);
         System.out.print(". " + str +"
Your answer:      ");
         String answer="";
         try{
             answer=input.nextLine();
         }catch(Exception e){
         }
         System.out.print("true answer:  "+sum.toString()+"    ");
         number re=sum.add(new number(10));
         try{
             re=new number(answer);
             if(re.equals(sum))
             {
                 System.out.println("You are right!");
                 right=right+1;
             }else {
                 System.out.println("You are wrong!");
             }
         }catch(Exception e){
             if(answer.indexOf('.')!=-1)
             {
                 try{
                     double ant=Double.parseDouble(answer);
                     if(Math.abs(ant-sum.ParseDouble())<1e-5)
                     {
                         System.out.println("You are right!");
                         right=right+1;
                     }else {
                         System.out.println("You are wrong!");
                     }
                 }catch(Exception ex){
                     System.out.println("You are wrong!");
                 }
             }else{
                 System.out.println("You are wrong!");
             }
         }        
         out.print(i+1);
         out.println(". " + str );
         out.println("Your answer:      "+answer);
         out.println("True answer:     "+sum.toString());
     }
     System.out.println(right+" / 25, So your accuracy is "+right/25.0);
     out.println(right+" / 25, So your accuracy is "+right/25.0);
     out.println();
     input.close();
     out.close();
     System.out.println();
 }

 private static void GetQuestion() {
 
     str = "";
     sum.set(0);;
     num_i = (int) (Math.random()*3)+3;
     quesGrow();
 }

 private static void quesGrow() {
     if( num_i > 1 ) {
         int j = num_i;
         num_i--;
         quesGrow();
         
         int ck=(int)(Math.random()*4);
         number w;
         if(ck!=0)
             w=new number(1+(int)(Math.random()*numberRange));
         else w=new number(1+(int)(Math.random()*numberRange),1+(int)(Math.random()*numberRange));
         int t=(int)(Math.random()*2);
         int f=(int)(Math.random()*4);
         
         if(t == 0)
         {
             if( f == 0 ) {
                 sum = sum.add(w);
                 str = str + "+" + w.toString();
             }
             if( f == 1 ) {
                 sum = sum.sub(w);
                 str = str + "-" +w.toString();    
             }
             if( f == 2 ) {
                 if( j < 3 ) {
                     sum = sum.mul(w);
                     str = str + "*" + w.toString();
                 }
                 else {
                     sum = sum.mul(w);
                     str = "(" +str+ ")" + "*" + w.toString();
                 }
             }
             if ( f == 3 ) {
                 
                 if( j < 3 ) {
                     sum = sum.div(w);
                     str = str + " / " + w.toString();
                 }
                 else {
                     sum = sum.div(w);
                     str = "(" +str+ ")" + " / " + w.toString();
                 }
             }
         }
         else
         {
             if( f == 0 ) {
                 sum = sum.add(w);
                 str = w.toString() + "+" + str;    
             }
             if( f == 1 ) {
                 if( j < 3 ) {
                     sum = w.sub(sum);
                     str = w.toString() + "-" + str;
                 }
                 else {
                     sum = w.sub(sum);
                     str = w.toString() + "-" + "(" +str+ ")";
                 }
             }
             if( f == 2 ) {
                 if( j < 3 ) {
                     sum = sum.mul(w);
                     str = w.toString()+ "*" + str;
                 }
                 else {
                     sum = sum.mul(w);
                     str = w.toString() + "*" + "(" +str+ ")";
                 }
             }
             if( f == 3) {
                 if( j < 3 ) {
                     sum = w.div(sum);
                     str = w.toString() + " / " + str;
                 }
                 else {
                     sum = w.div(sum);
                     str = w.toString()+ " / " + "(" +str+ ")";
                 }
             }
         }
     }
     else if( num_i == 1 ) {
         int ck=(int)(Math.random()*4);
         number w;
         if(ck!=0)
             w=new number(1+(int)(Math.random()*numberRange));
         else w=new number(1+(int)(Math.random()*numberRange),1+(int)(Math.random()*numberRange));
         sum = sum.add(w);
         str = str + w.toString();
     }
 }
}

运行结果

总结

没有能够写出筛选年级的代码，用代码编辑出了简单的加减乘除运算，复合运算也可以计算，遇到的困难非常多，还是在百度搜索到的结果才解决了问题，下面会进一步解决问题

作业二

gitee链接

https://gitee.com/chen_gang11/learngit/blob/master/daima.txt

总结

这个git过程些许繁琐，做的时候很生疏，遇到很多不会的过程，但是看教程最后一一解决了。