i need something to not make my program not close right after i run it

hi i am new to c++ and i just downloaded it and started a guide to it. after a few pages in it, it showed me a hello world program. I have dev c++ 5 when i run the program it opens and everything but then it closes before i see anything, i am a noob so please answer and dont say something like, that is so easy to answer and not say anything. here is the code

#include <iostream.h>


int main();
{
cout <<"Hello World!\n";
return 0;
}


thankyou!
Have a look at this thread, this problem has been discussed at length
http://www.cplusplus.com/forum/beginner/1988/
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