1. #include<stdio.h>
   
2. #include<time.h>
   
3. #include<stdlib.h>
   
4. int f1(int k1,int k2)
   
5. {srand(time(NULL));
   
6. k1=1+rand()%9;
   
7. k2=1+rand()%9;
   
8. printf("%d*%d\n",k1,k2);
   
9. return 0;
   
10. }
    
11. int f2(int k1,int k2)
    
12. {srand(time(NULL));
    
13. k1=1+rand()%99;
    
14. k2=1+rand()%9;
    
15. printf("%d*%d\n",k1,k2);
    
16. return 0;
    
17. }
    
18. int f3(int k1,int k2)
    
19. {srand(time(NULL));
    
20. k1=1+rand()%99;
    
21. k2=1+rand()%99;
    
22. printf("%d*%d\n",k1,k2);
    
23. return 0;
    
24. }
    
25. void g()
    
26. {int k;
    
27. srand(time(NULL));
    
28. k=1+rand()%3;
    
29. if(k==1) printf("Very Good\n");
    
30. if(k==2) printf("excellent\n");
    
31. if(k==3) printf("keep up\n");
    
32. }
    
33. void h()
    
34. {int k;
    
35. srand(time(NULL));
    
36. k=1+rand()%3;
    
37. if(k==1) printf("no,please try again\n");
    
38. if(k==2) printf("no,try once more\n");
    
39. if(k==3) printf("no,keep trying\n");
    
40. }
    
41. void main()
    
42. {int k1,k2,n,m;
    
43. printf("选择两个个位数乘法输入1，选择一个十位数与一个个位数乘法输入2，选择两个个位数乘法输入3\n");
    
44. scanf("%d",&n);
    
45. if(n==1)
    
46. f1(k1,k2);
    
47. if(n==2)
    
48. f2(k1,k2);
    
49. if(n==3)
    
50. f3(k1,k2);
    
51. scanf("%d",&m);
    
52. if(m==(k1*k2))
    
53. g();
    
54. if(m!=(k1*k2))
    
55. {printf("答案是%d\n",k1*k2);
    
56. h();}
    
57. }

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:L求楼主大神写写注释，俺c基础比较差看不太懂