Interested in learning GTB? You are highly recommended to have basic knowledge of TI-BASIC 83/84 before attempting to learn GTB.

Also, here is the definition of code that is golfed.

Overview

The structure and basic principles of GTB are similar to those of TI-BASIC:

• Each of these characters remain one byte for byte counts
• If/Then/Else/End structure is kept
• Colons separate commands

Basic Program

Input a number; if the number is 101, print HELLO WORLD. Otherwise, keep looping till 101 is received as input.

TI-BASIC (ungolfed), 70 characters

:Lbl 1
:Input N
:If N=101
:Then
:Disp "HELLO WORLD"
:Else
:Goto 1
:End

TI-BASIC (golfed), 57 characters

:Lbl 1:Input N:If N=101:Goto 2:Goto 1:Lbl 2:"HELLO WORLD"

GTB, 29 characters

[`N@N--=1g;1]l;1"HELLO WORLD"