系统要求:

1、自动出题,涉及加减乘除四则运算

2、运算为两位数之间

3、减法不能出现负数

4、乘法结果不超过100

5、除法必须整除

6、用户决定出题量

7、用户决定几道题一换行

 1 import java.util.Random;
 2 import java.util.Scanner;
 3 public class Test01 {
 4     public static void main(String[] args) {
 5         int [][] arr=new int[100000][3];
 6         int [] temp01=new int [3];
 7         Scanner in=new Scanner(System.in);
 8         System.out.println("*******给小学生的自动出题系统******");
 9         System.out.println("请输入题量:");
10         int m=in.nextInt();
11         System.out.println("请选择几题一换行:");
12         int n=in.nextInt();
13         int x=1,y=0,num1,num2,cmp;
14         boolean flag=false;
15         for (int i = 0; i < m; i++) {
16             flag=false;
17             Random r = new Random();
18             int temp;
19             num1 = r.nextInt(100)+1;
20             num2 = r.nextInt(100)+1;
21             cmp=r.nextInt(4);
22             temp01[0]=num1;//用temp01数组存储随机生成的三个数据
23             temp01[1]=num2;
24             temp01[2]=cmp;
25             for(int j=0;j<y;j++) {
26                 if(arr[j]==temp01) {
27                     flag=true;
28                     break;
29                 }
30             }
31             if(flag)//如果重复
32                 continue;
33             else
34             {
35                 arr[y][0]=num1;
36                 arr[y][1]=num2;
37                 arr[y][2]=cmp;
38                 y++;
39                 switch(cmp) {
40                 case 0://
41                     System.out.print("第"+x+"个题目:"+num1+"+"+num2+"=   ");
42                     break;
43                 case 1://
44                     if(num1<num2) {
45                         temp=num1;
46                         num1=num2;
47                         num2=temp;
48                     }
49                     System.out.print("第"+x+"个题目:"+num1+"-"+num2+"=    ");
50                     break;
51                 case 2://
52                     if(num1<num2) {
53                         temp=num1;
54                         num1=num2;
55                         num2=temp;
56                     }
57                     while(num1*num2>=100)
58                         num1--;
59                     System.out.print("第"+x+"个题目:"+num1+"*"+num2+"=    ");
60                     break;
61                 case 3:
62                     if(num1<num2) {
63                         temp=num1;
64                         num1=num2;
65                         num2=temp;
66                     }
67                     while(num1%num2!=0)
68                         num2--;
69                     System.out.print("第"+x+"个题目:"+num1+"/"+num2+"=    ");
70                     break;
71                 }
72                 if(x%n==0)
73                     System.out.println();
74                 x++;
75             }
76         }
77     }
78 }
02-10 21:02