考试系统

Posted 2020-10-08 陌尘枫

设计实现一个小学生数学考试系统，完成随机出题（简单的四则运算），学生答题，自动判分的功能。

 1 package experiment;
 2 
 3 import java.util.Scanner;
 4 
 5 
 6 public class Arithmetic {
 7     public static void main(String args[]) {
 8         begin_test();
 9     }
10     //随机产生数字
11     public static double r_random(int min, int max) {
12         double ii;
13         ii = (double)(min + Math.random() * (max - min + 1));
14         return ii;
15     }
16     //随机产生符号
17     public static char make_sym()
18     {
19         int ii;
20         ii = (int)(Math.random() * 3);
21         if(ii == 0)
22             return ‘+‘;
23         else if(ii == 1)
24             return ‘-‘;
25         else if(ii == 2)
26             return ‘*‘;
27         else
28             return ‘/‘;
29     }
30     //随机产生式子
31     public static int make_formula(int min, int max)
32     {
33         int ii, ij;
34         char operator;
35         
36         
37         ii = (int)r_random(min, max);
38         ij = (int)r_random(min, max);
39         
40         operator = make_sym();
41         System.out.println("随机产生的四则运算为：" + ii + " " +  operator + " " +  ij + " = ?");
42         if(operator == ‘+‘)
43             return (ii + ij);
44         else if(operator == ‘-‘)
45             return (ii - ij);
46         else if(operator == ‘*‘)
47             return (ii * ij);
48         else
49         {
50             return Math.round(ii / ij);
51         }
52     }
53     
54     //判断结果是否正确
55     public static boolean test( int min, int max)
56     {
57         double answer, r_answer;
58         System.out.println("请输入答案(注意除法时答案四舍五入取整):");
59         Scanner sc = new Scanner(System.in);
60         answer = make_formula(min, max);
61         r_answer = sc.nextDouble();
62         if(answer == r_answer) {
63             System.out.println("正确！");
64             return true;
65         }
66         else {
67             System.out.println("错误！");
68             return false;
69         }
70     }
71     
72     //计分
73     public static double score(int num, int min, int max) {
74         double sum = 0;
75         double one_score = (float)(100 / num);
76         for(int i = 0; i < num; i++) {
77             if(test(min, max)) {
78                 sum += one_score;
79             }
80             else {
81                 continue;
82             }
83         }
84         return sum;
85     }
86     //考试开始
87     public static void begin_test() {
88         int num, min, max;
89         double sum;
90         Scanner sc = new Scanner(System.in);
91         System.out.println("请输入需要产生的试题数：");
92         num = sc.nextInt();
93         System.out.println("请输入产生四则运算的范围（最小值和最大值）");
94         min = sc.nextInt();
95         max = sc.nextInt();
96         sum = score(num, min, max);
97         System.out.println("考试结束，最后得分为：" + sum);
98     }
99 }