New here!

[Joalyimo]

I am new in this forum and I would beg your help and cooperation in general. I'm happy knowing that I'm going to share the knowledge I'm having in this field.

Wow!

#include<iostream.h>

void main()
{
clrscr();
cout<<"mwaaaaaaaaaaaaaaaaaaah!!";
getch();
}

[Ramses12]

It's iostream not iostream.h and you need to either add a using namespace std; line or use std::cout for that to compile. :]
Welcome!

[Moschops]

clrscr(); and getch(); aren't standard and won't work on many systems.

void main()
In C++, main returns an int.