Arithmometer: A Node.js implementation

Posted 2021-01-07 m870100

GitHub: https://github.com/m8705/Arithmometer

 

Project elaboration

In this project, We are required to actualize a command line program for automatically generating four arithmetic problems for primary schools. 

Now the project is still in progress, we have so far finished exercise judgement, and soon we will update more information.

Team members: Wu Tang Huang, Zhang Guo Jun

 

Detail description

Program usage

Generate exercise file: 

node e.js -n 10 -r 10

Validate exercise:

node e.js -e exercisefile.txt -a answerfile.txt

Parameter and regulation

1. Use -n parameter to control the number of generated questions（1~10000）.

2. Use -r parameter to control the range of numeric value (natural number, true fraction and true fraction denominator) in the title（1~100）.

3. The calculation process in the generated problem does not produce a negative number, that is, if there is a sub-expression in the arithmetic expression, such as e1 - e2, then e1 < e2

4. If there is a subexpression e1 ÷ e2 in the generated exercise, the result should be true score.

5. There are no more than 3 operators in each problem.

6. The problem generated by the program running at one time can not be repeated, that is, any two problems can not be transformed into the same problem by the finite number of exchange + and * arithmetic expressions.The generated problem is stored in the Exercises.txt file under the current directory of the execution program.

7. At the same time, the answers to all the questions are computed and stored in the Answers.txt file in the current directory of the execution program.

8. The program should support the generation of ten thousand problems.

9. Program support for a given question file and answer file, determine the right and wrong answers and statistics, statistics output to the file Grade.txt

 

Code preview

  1 //console.log(process.argv);
  2 
  3 var arg1 = process.argv[2];
  4 var arg2 = process.argv[3];
  5 var arg3 = process.argv[4];
  6 var arg4 = process.argv[5];
  7 
  8 if( (arg1 === "-n") && (arg3 === "-r") ){//生成题目
  9     
 10     arg2 = Math.floor(arg2);//取整
 11     if( arg2 > 0 && arg2 <= 10000 ){
 12         
 13         arg4 = Math.floor(arg4);//取整
 14         if( arg4 > 0 && arg4 <= 100 ){
 15             
 16             produce(arg2,arg4);
 17             
 18         }
 19         else{
 20             
 21             console.log("题目生成范围不正确！允许范围：1~100");
 22             
 23         }
 24         
 25     }
 26     else{
 27         
 28         console.log("题目数量不正确！允许范围：1~10000");
 29         return;
 30         
 31     }
 32     
 33 }
 34 else if( (arg1 === "-e") && (arg3 === "-a") ){//检查题目
 35     
 36     arg2 = arg2 ? arg2 : "exercisefile.txt";
 37     arg4 = arg4 ? arg4 : "answerfile.txt";
 38     
 39     judge(arg2,arg4);
 40     
 41 }
 42 else{
 43     
 44     console.log("参数错误！");
 45     console.log("用例：");
 46     console.log("生成题目：node e.js -n 10 -r 10");
 47     console.log("检查题目：node e.js -e exercisefile.txt -a answerfile.txt");
 48     
 49 }
 50 
 51 function convert(str){//将任何数转成真分数（小数不换）
 52     
 53     //整数 2 = 2‘1/1
 54     //真分数 3/8
 55     //假分数 2‘2/3
 56     //带分数 1‘1/1
 57     
 58     if( str.indexOf("/") >= 0 ){//真分数或带分数
 59         
 60         if( str.indexOf("‘") >= 0 ){//带分数
 61             
 62             first = str.split("‘")[0];
 63             second = str.split("‘")[1];
 64             
 65             up = second.split("/")[0];
 66             down = second.split("/")[1];
 67             
 68             if( ( up === down ) || ( down === "1" ) ){
 69                 return "ERROR";
 70             }
 71             
 72             str = ( (+first) * (+down) + (+up) ) + "/" + down;
 73             
 74         }
 75         else{//真分数
 76             ;
 77         }
 78         
 79     }
 80     else{//整数
 81         
 82         str = str + "/1";
 83         
 84     }
 85     
 86     console.log(str);
 87 }
 88 
 89 
 90 function produce(n, range){
 91     
 92     //console.log(n,range);
 93     
 94     //随机生成符号（1,2,3） -> 随机生成运算数种类 -> 随机生成运算数 -> 随机生成括号
 95     
 96     var symbol = Math.random();
 97     var symbolNum;
 98     
 99     if( symbol <= 1/3 ){//生成一个符号
100         symbolNum = 1;
101     }
102     else if( symbol <= 2/3 ){//生成两个符号
103         symbolNum = 2;
104     }
105     else{//生成三个符号
106         symbolNum = 3;
107     }
108     
109     var symbolChoice = [];
110     var tmp;
111     for(var a = 0; a < symbolNum; a++){
112         
113         tmp = Math.random();
114         if( tmp <= 1/4 ){
115             symbolChoice.push("+");
116         }
117         else if( tmp <= 2/4 ){
118             symbolChoice.push("-");
119         }
120         else if( tmp <= 3/4 ){
121             symbolChoice.push("*");
122         }
123         else{
124             symbolChoice.push("/");
125         }
126         
127     }
128     
129     console.log(symbolChoice);
130     
131     
132     var numChoice = [];
133     
134     
135     
136 }
137 
138 
139 function judge(file1,file2){
140     
141     console.log(file1,file2)
142     
143     var fs = require("fs");
144     
145     fs.readFile(file1, function (err1, data1) {// 异步读取练习题
146     
147         if (err1) {
148             return console.error(err1);
149         }
150         
151         var lines1 = data1.toString().split("
");
152         
153         fs.readFile(file2, function (err2, data2) {// 异步读取答案
154     
155             if (err2) {
156                 return console.error(err2);
157             }
158         
159             var lines2 = data2.toString().split("
");
160         
161             if(lines1.length !== lines2.length){
162                 
163                 console.log("题目数与答案数不匹配！题目数：" + lines1.length + "答案数" + lines2.length );
164                 return;
165                 
166             }
167             
168             var correct = [];
169             var wrong = [];
170     
171             var expression;
172             var left,right;
173     
174     
175             for( var a = 0; a < lines1.length; a++ ){//按行读取
176         
177                 expression = lines1[a].split(". ")[1];
178                 left = eval(expression);
179         
180                 answer = lines2[a].split(". ")[1];
181                 right = eval(answer);
182         
183                 if( Math.abs(right - left) < 1e-10 || Math.abs(left - right) < 1e-10 ){//正确
184             
185                     correct.push( (a + 1) + "" );
186             
187                 }
188                 else{//错误
189             
190                     wrong.push( (a + 1) + "" );
191             
192                 }
193         
194         
195             }
196     
197             var result = "";
198             result += "Correct: " + correct.length + " (" + ("" + correct ) + ")
";
199             result += "Wrong: " + wrong.length + " (" + ("" + wrong ) + ")
";
200     
201     
202             fs.writeFile(‘Grade.txt‘, result,  function(err) {
203                 if (err) {
204                     return console.error(err);
205                 }
206                 console.log("数据写入成功！");
207                 console.log("--------我是分割线-------------");
208             });
209         
210         });
211         
212     });
213     
214         
215     
216 }

 

PSP2.1	Personal Software Process Stages	预估耗时（分钟）	实际耗时（分钟）
Planning	计划	120	60
· Estimate	· 估计这个任务需要多少时间	15	15
Development	开发	360	300
· Analysis	· 需求分析 (包括学习新技术)	60	60
· Design Spec	· 生成设计文档	30	30
· Design Review	· 设计复审 (和同事审核设计文档)	30	30
· Coding Standard	· 代码规范 (为目前的开发制定合适的规范)	15	15
· Design	· 具体设计	60	60
· Coding	· 具体编码	120	100
· Code Review	· 代码复审	120	160
· Test	· 测试（自我测试，修改代码，提交修改）	40	40
· Reporting	· 报告	90	90
· Test Report	· 测试报告	60	60
· Size Measurement	· 计算工作量	30	30
· Postmortem & Process Improvement Plan	· 事后总结, 并提出过程改进计划	30	30
合计		1180	1080