C language programming simple timing shutdown procedures

Write a regular shutdown small program, can immediately shut down the computer, also can 1 period of time after the shutdown of the computer.

The main focus here is the system() command.

Code implementation:

#include<stdio.h>
#include<string.h>
#include<stdlib.h>
int main()
{
  char cmd[20]="shutdown -s -t ";
  char t[5]="0";
  int c;
  system("title C Language shutdown program "); // Set up the cmd The window title 
  system("mode con cols=48 lines=25"); // Window width and height  
  system("color f0"); // Can be written as  red  Bring up the color group 
  system("date /T");
  system("TIME /T");
  printf("----------- C Language shutdown program  -----------\n");
  printf("1. implementation 10 Shut down the computer at a timer within minutes \n");
  printf("2. Shut down the computer immediately \n");
  printf("3. Log off computer \n");
  printf("0. Log out \n");
  printf("-------------------------------------\n");
  scanf("%d",&c);
  switch(c) {
    case 1:
      printf(" How many seconds do you want to automatically shut down your computer? ( 0~600 ) \n");
      scanf("%s",t);
      system(strcat(cmd,t));
      break;
    case 2:
      system("shutdown -p");
      break;
    case 3:
      system("shutdown -l");
      break;
    case 0:
      break;
    default:
      printf("Error!\n");
  }
  system("pause");
  return 0;
}

This program is not very useful, but it gives us an idea of the system() function.

Under Windows, the system() function can execute the dos command. In Unix/Linux, Shell can be executed.

Please run the above program under Windows. The setup and shutdown functions of the dos interface in the program are realized through the dos command.