C language: time off

Time off to write a small program, you can turn off the computer immediately, or shut down the computer after a period of time.

system () command

code implements:

1. #include<stdio.h>
2. #include<string.h>
3. #include<stdlib.h>
4.  
5. int main ()
6. {
7. char cmd[20]="shutdown -s -t ";
8. char t[5]="0";
9. int c;
10.  
11. system ( "title C language program shutdown"); // set up the cmd window title
12. System ( "Lines MODE CON cols = 48 = 25"); // Window Width Height
13. System ( "Color F0"); // can be written to call up the red color group
14. system("date /T");
15. system("TIME /T");
16.  
17. printf ( "----------- C language shutdown procedures ----------- \ n");
18. the printf ( " 1. achieved in 10 minutes and closing timing of the computer \ n");
19. printf ( " 2. Immediately turn off your computer \ n");
20. printf ( " 3. Log off the computer \ n");
21. printf ( " 0. exit the system \ n");
22. printf("-------------------------------------\n");
23.  
24. scanf("%d",&c);
25. switch(c) {
26. case 1:
27. printf ( "You want to automatically shut down the computer after the number of seconds (0 ~ \ n 600)?");
28. scanf("%s",t);
29. system(strcat(cmd,t));
30. break;
31. case 2:
32. system("shutdown -p");
33. break;
34. case 3:
35. system("shutdown -l");
36. break;
37. case 0:
38. break;
39. default:
40. printf("Error!\n");
41. }
42. system("pause");
43. return 0;
44. }

While this program has little practical value, but allows us to understand the system () function.

Under Windows, system () function can perform dos command; in Unix / Linux can be performed Shell.

The program was run on Windows, a program for setting up and shutdown dos interface is through the dos command to achieve.