《构建之法》第二次作业

 1 import java.io.BufferedReader;
 2 import java.io.IOException;
 3 import java.io.InputStreamReader;
 4 import java.util.Scanner;
 5 
 6 public class czy5 {
 7     public static int suiji(int num1, int num2) {
 8         int C = (int) num1 + (int) (Math.random() * (num2 - num1));
 9         return C;
10     }
11 
12     public static void main(String[] args) {
13 
14         int S, a, b, i = 1, f = 0, h = 0, c;
15         String ss;
16 
17         double D;
18         while (i <= 5) {
19             S = suiji(1, 4);
20             i = i + 1;
21             a = suiji(0, 100);
22             b = suiji(0, 100);
23 
24             System.out.println("你想输出四则运算的个数是：");
25             Scanner in = new Scanner(System.in);
26             int num = in.nextInt();
27 
28             System.out.println("请输入4个数，1代表加法，2代表减法，3代表乘法，4代表除法");
29             try {
30                 BufferedReader b1 = new BufferedReader(new InputStreamReader(
31                         System.in));
32                 ss = b1.readLine();
33                 c = Integer.parseInt(ss);
34             } catch (IOException e) {
35             }
36 
37             switch (S) {
38             case 0:
39                 break;
40             case 1: {
41                 System.out.println(a + "+" + b + "=");
42                 Scanner reader = new Scanner(System.in);
43                 D = reader.nextInt();
44                 if (D == a + b) {
45                     h++;
46                 } else {
47                     System.out.println("答错了，正确答案是：" + (a + b));
48 
49                 }
50             }
51             case 2: {
52                 System.out.println(a + "-" + b + "=");
53                 Scanner reader1 = new Scanner(System.in);
54                 D = reader1.nextInt();
55                 if (D == a - b) {
56                     h++;
57                 } else {
58                     System.out.println("答错了，正确答案是：" + (a - b));
59 
60                 }
61             }
62             case 3: {
63                 System.out.println(a + "*" + b + "=");
64                 Scanner reader2 = new Scanner(System.in);
65                 D = reader2.nextInt();
66                 if (D == a * b) {
67                     h++;
68                 } else {
69                     System.out.println("答错了，正确答案是：" + (a * b));
70 
71                 }
72             }
73             case 4: {
74                 System.out.println(a + "/" + b + "=");
75                 Scanner reader3 = new Scanner(System.in);
76                 D = reader3.nextInt();
77                 if (D == a / b) {
78                     h++;
79                 } else {
80                     System.out.println("答错了，正确答案是：" + (a / b));
81 
82                 }
83             }
84             }
85 
86             System.out.print("你答对的总题数为：" + h + "");
87         }
88     }
89 }