C program to shutdown or turn off computer

***C programming code for Windows XP:

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

int 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;
}

***C programming code for Windows 7:

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

int main()
{
system("C:\\WINDOWS\\System32\\shutdown /s");

return 0;
}

***C programming code for Ubuntu Linux:
#include <stdio.h>

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