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") ){//生成題目
  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("題目生成範圍不正確！允許範圍：1~100");
 22             
 23         }
 24         
 25     }
 26     else{
 27         
 28         console.log("題目數量不正確！允許範圍：1~10000");
 29         return;
 30         
 31     }
 32     
 33 }
 34 else if( (arg1 === "-e") && (arg3 === "-a") ){//檢查題目
 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("參數錯誤！");
 45     console.log("用例：");
 46     console.log("生成題目：node e.js -n 10 -r 10");
 47     console.log("檢查題目：node e.js -e exercisefile.txt -a answerfile.txt");
 48     
 49 }
 50 
 51 function convert(str){//將任何數轉成真分數（小數不換）
 52     
 53     //整數 2 = 2‘1/1
 54     //真分數 3/8
 55     //假分數 2‘2/3
 56     //帶分數 1‘1/1
 57     
 58     if( str.indexOf("/") >= 0 ){//真分數或帶分數
 59         
 60         if( str.indexOf("‘") >= 0 ){//帶分數
 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{//真分數
 76             ;
 77         }
 78         
 79     }
 80     else{//整數
 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     //隨機生成符號（1,2,3） -> 隨機生成運算數種類 -> 隨機生成運算數 -> 隨機生成括號
 95     
 96     var symbol = Math.random();
 97     var symbolNum;
 98     
 99     if( symbol <= 1/3 ){//生成一個符號
100         symbolNum = 1;
101     }
102     else if( symbol <= 2/3 ){//生成兩個符號
103         symbolNum = 2;
104     }
105     else{//生成三個符號
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) {// 異步讀取練習題
146     
147         if (err1) {
148             return console.error(err1);
149         }
150         
151         var lines1 = data1.toString().split("\r\n");
152         
153         fs.readFile(file2, function (err2, data2) {// 異步讀取答案
154     
155             if (err2) {
156                 return console.error(err2);
157             }
158         
159             var lines2 = data2.toString().split("\r\n");
160         
161             if(lines1.length !== lines2.length){
162                 
163                 console.log("題目數與答案數不匹配！題目數：" + lines1.length + "答案數" + 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++ ){//按行讀取
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 ){//正確
184             
185                     correct.push( (a + 1) + "" );
186             
187                 }
188                 else{//錯誤
189             
190                     wrong.push( (a + 1) + "" );
191             
192                 }
193         
194         
195             }
196     
197             var result = "";
198             result += "Correct: " + correct.length + " (" + ("" + correct ) + ")\n";
199             result += "Wrong: " + wrong.length + " (" + ("" + wrong ) + ")\n";
200     
201     
202             fs.writeFile(‘Grade.txt‘, result,  function(err) {
203                 if (err) {
204                     return console.error(err);
205                 }
206                 console.log("數據寫入成功！");
207                 console.log("--------我是分割線-------------");
208             });
209         
210         });
211         
212     });
213     
214         
215     
216 }

Arithmometer: A Node.js implementation