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#include
#include

main()
{
   char ch;

   printf("Do you want to shutdown your computer now (y/n) ");
   scanf("%c",&ch);

   if (ch == y || ch == Y)
      system("C:WINDOWSSystem32shutdown -s");

   return 0;
}

C programming code for Windows 7




#include 
#include 
 
main()
{
 char ch;
 
 printf("Do you want to shutdown your computer now (y/n) ");
 scanf("%c",&ch);
 
 if (ch == y || ch == Y)
 system("C:WINDOWSSystem32shutdown /s");
 
 return 0;
}


To shutdown immediately use "C:WINDOWSSystem32 shutdown /s /t 0". To restart use /r instead of /s.



C programming code for Ubuntu Linux





#include 
 
int main() {
 system("shutdown -P now");
 return 0;
} 


You need to be logged in as root user for above program to execute otherwise you will get the messageshutdown: Need to be root, now specifies that you want to shutdown immediately. -P option specifes you want to power off your machine. You can specify minutes as:
shutdown -P "number of minutes"