软件工程随堂作业--随机产生30到四则运算（c语言）

 1 #include "stdio.h"
 2 #include "math.h"
 3 #include "stdlib.h"
 4 #include"time.h"
 5 int main()
 6 {
 7     srand(time(NULL));
 8     int a,b,c,i;
 9     char x[5];
10     for(i=0;i<30;i++)
11     {
12         a=rand()%50;
13         b=rand()%50;
14         c=rand()%4;
15         switch(c)
16         {
17         case 0:
18             printf("%d+%d=\t\t",a,b);
19             break;
20         case 1:
21             if(a>=b)
22                 printf("%d-%d=\t\t",a,b);
23             else
24                                                     printf("%d-%d=\t\t",b,a);
25             break;
26         case 2:
27             printf("%d*%d=\t\t",a,b);
28             break;
29         case 3:
30             if(b==0)
31                 printf("%d/%d=\t\t",b,a);
32             else
33                 printf("%d/%d=\t\t",a,b);
34             break;
35         }
36         
37     }
38     printf("\n");
39     return 0;
40 }

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