Editing TI-BASIC (section)

=== Control flow ===
[[Control flow]] statements include [[conditional (programming)|if-then-else blocks]], [[for loop]]s, [[while loop]]s, and [[do while loop|repeat loops]], though no [[switch statement]]s. 
The main control flow statements are:<ref>{{Cite web |title=Skill Builder 1: Loops and the For(...) loop |url=https://education.ti.com/-/media/ti/files/resources/ti-codes/84/unit-4/skill-builder-1/unit-4-skill-builder-1_teacher.pdf |access-date=April 17, 2025 |website=TI Education}}</ref>
<pre>
 If condition
 Then
 ...
 Else
 ...
 End

 For(variable,start,stop,step)
 ...
 End

 While condition
 ...
 End

 Repeat condition
 ...
 End
</pre>
Unusual for a high level language, TI-BASIC implementations include IS> (Increment and Skip if Greater Than) and DS< (Decrement and Skip if Less Than) statements, constructs generally associated with [[assembly language]]s. Sections of programs can be [[Label (programming language)|labeled]]; however, particularly on the Z80 models, the labels function as destinations for [[Goto]] statements or <code>Menu(</code> functions rather than as program or block labels.

Availability of functions and subroutines depends on the implementation; the versions available on the TI-82-descended calculators do not even support a [[GOSUB]]-like function, though it is possible to call programs from within each other and share variables between programs. TI-89/92-based designs can have access to shared functions, essentially programs capable of returning a value.