設計實現一個小學生數學考試系統，完成隨機出題（簡單的四則運算），學生答題，自動判分的功能。

 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     //隨機產生數字
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     //隨機產生符號
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     //隨機產生式子
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("隨機產生的四則運算為：" + 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     //判斷結果是否正確
55     public static boolean test( int min, int max)
56     {
57         double answer, r_answer;
58         System.out.println("請輸入答案(註意除法時答案四舍五入取整):");
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("正確！");
64             return true;
65         }
66         else {
67             System.out.println("錯誤！");
68             return false;
69         }
70     }
71     
72     //計分
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     //考試開始
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("請輸入需要產生的試題數：");
92         num = sc.nextInt();
93         System.out.println("請輸入產生四則運算的範圍（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("考試結束，最後得分為：" + sum);
98     }
99 }

考試系統