I want to write a graphical code in C++ that with one button show hello world and with another shows goodbye and close the app

Question

I know how to show hello world but not about the other
I need it please somebody help me

Answer 1

if it's okay that you'll have to press enter twice then I have an idea. Just put getch() between those two statements.
cout<<"Hello World";
getch();
cout<<"goodbye";
Like this.