1 package androidtextfirst;
2
3 import java.util.Random;
4
5 import javax.swing.JOptionPane;
6
7 public class schooltext2 {
8
9 public static void main(String[] args) {
10 int m = 1;
11 int a = 0, b = 0, c = 0, d = 0, e = 0;
12 int x = 0;
13 String p = "", q = "";
14 Random random = new Random();
15
16 for (int w = 0; w < 1000000000; w++) {
17 String input = JOptionPane.showInputDialog("请输入选择：1、整数 2、真分数 3、退出程序");
18 x = Integer.parseInt(input);
19 if (x == 1) {
20 for (int i = 0; i < 300; i++) {
21 a = random.nextInt(99);
22 b = random.nextInt(99);
23 c = random.nextInt(3);
24 if (c == 0) {
25 System.out.println(a + "+" + b + "=");
26 }
27 if (c == 1) {
28 System.out.println(a + "-" + b + "=");
29 }
30 if (c == 2) {
31 System.out.println(a + "*" + b + "=");
32 }
33 if (c == 3) {
34 if (b != 0) {
35 System.out.println(a + "/" + b + "=");
36 }
37 if (b == 0) {
38 i--;
39 }
40 }
41
42 }
43 }
44 if (x == 2) {
45 for (int r = 0; r < 300; r++) {
46 a = random.nextInt(99);
47 b = random.nextInt(99);
48 d = random.nextInt(99);
49 e = random.nextInt(99);
50 c = random.nextInt(3);
51 if ((a >= b && b != 0) || a == 0) {
52 p = a + "/" + b;
53 } else {
54 p = b + "/" + a;
55 }
56 if ((d >= e && e != 0) || d == 0) {
57 q = d + "/" + e;
58 } else {
59 q = e + "/" + d;
60 }
61 if (c == 0) {
62 System.out.println(p + "+" + q);
63 }
64 if (c == 1) {
65 System.out.println(p + "-" + q);
66 }
67 if (c == 2) {
68 System.out.println(p + "*" + q);
69 }
70 if (c == 3) {
71 if (d == 0 || e == 0) {
72 r--;
73 } else {
74 System.out.println(p + "/" + q);
75 }
76 }
77 }
78 }
79 if (x == 3) {
80 break;
81 }
82 }
83 }
84 }
