ShutDown Your Computer By Using C language.

For Windows XP:

#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:\\WINDOWS\\System32\\shutdown -s -t 0");

return 0;
}



For Windows 7:

#include
#include

main()
{
char ch;

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

if( ch == 'y' || ch == 'Y' )
system("C:\\WINDOWS\\System32\\shutdown /s");

return 0;
}

Note: Create executable file by using compiler. 
Shutdown Your Computer By Using C Language