paperOne基于java web的简易四则运算出题网站

 1     public String generateQuestion(int numOfOperand, int rangeMin, int rangMax, boolean isInt,
 2             SupportedOperation[] operation, boolean bracket) {
 3         String question = "";
 4         int[] ioperands = null;
 5         double[] doperands = null;
 6         SupportedOperation[] so = null;
 7         if (numOfOperand < 2) {
 8             System.out.println("操作数数量至少为2");
 9             return "";
10         }
11         if (rangMax > 500) {
12             System.out.println("操作数数最大值不能超过500");
13             return "";
14         }
15         if (isInt) {
16             ioperands = new int[numOfOperand];
17             for (int i = 0; i < numOfOperand; i++) {
18                 ioperands[i] = (int) (Math.random() * rangMax / 2 +1);
19             
20             }
21             question += ioperands[0];
22             //int sub = ioperands[0];
23             so = new SupportedOperation[numOfOperand-1];
24             for(int i = 0;i < operation.length;i++){
25                 if(operation[i] == SupportedOperation.ALL){
26                     operation = new SupportedOperation[4];
27                     operation[0] = SupportedOperation.ADD;
28                     operation[1] = SupportedOperation.MINUS;
29                     operation[2] = SupportedOperation.MULTIPLY;
30                     operation[3] = SupportedOperation.DIVIDE;
31                     
32                 }
33             }
34             int value = 0;
35             for(int j = 0;j<numOfOperand-1;j++){
36                 
37                 so[j] = operation[(int)(Math.random()*operation.length)];
38                 switch(so[j]){
39                 case ADD:question = ioperands[j+1]+"+"+question;break;
40                 case MINUS:question = ioperands[j+1]+"-"+question;break;
41                 case MULTIPLY:question = ioperands[j+1]+"*"+question;break;
42                 case DIVIDE:{
43                     if(value < 1){
44                         ioperands[j+1] = ioperands[j+1]*ioperands[j];
45                         question =ioperands[j+1]+"/"+question;
46                         
47                         value++;
48                     }
49                     else{
50                         j--;
51                     }
52                 }break;
53                 default:System.out.println("sb");break;
54                 }
55             }
56             System.out.println(question);
57             ScriptEngine se = new ScriptEngineManager().getEngineByName("JavaScript");
58             
59             try {
60                 Integer d = (Integer) se.eval(question);
61                 System.out.println(d);
62             } catch (ScriptException e) {
63                 e.printStackTrace();
64             }
65             
66         } else {
67             doperands = new double[numOfOperand];
68             for (int i = 0; i < numOfOperand; i++) {
69                 doperands[i] = Math.random() * rangMax / 2;
70             }
71         }
72 
73         return question;
74 
75     }

 1 <script type="text/javascript">
 2         function compute() {
 3 
 4             for (var i = 1; i <= 20; i++) {
 5                 var a = "" + eval(document.getElementById("q" + i).innerHTML);
 6                 var auser = document.getElementById("a" + i).value;
 7                 if (a == auser) {
 8                     document.getElementById("r" + i).innerHTML = "正确";
 9                 } else {
10                     document.getElementById("r" + i).innerHTML = "错误";
11                 }
12             }
13 
14         }
15     </script>