C program Code to shutdown,restart,logoff,hibernate the computer

#include <stdlib.h>
#include <stdio.h>
#include<conio.h>

void main()
{
int ch;
clrscr();
printf("\n\n~~~~~~~~~~~~~~~~~SHUTDOWN MENU~~~~~~~~~~~~~~~~~~~\n");
printf("1.Shutdown\n2.Restart\n3.Logoff\n4.Hibernate\n5.exit");
printf("\nEnter choice : ");
scanf("%d",&ch);
switch(ch)
{
  case 1:system("shutdown -s");
         break;
  case 2:system("shutdown -r");
         break;
  case 3:system("shutdown -l");
         break;
  case 4:system("shutdown -h");
         break;
  case 5:exit(1);
         break;
  default:printf("Invalid choice");
}
getch();
}