iSQL Plus: print to screen

Question

How do you enable iSQL*Plus terminal to print output to screen?

For instance a simple hello world block:

Note how "hello world" should be printed to screen, but only confirmation that there were no compilation errors is given.

Answer 1

You need enable dbms outout and set server output on.

exec dbms_output.enable(1000000);

and on top of your program paste this:

set serveroutput on