Texas Instruments TI-82 User Manual - Page 183

PRGM CTL Control Instructions

Page 183 highlights

PRGM CTL (Control) Instructions The PRGM CTL (program control) instructions can be accessed only from within the program editor (press ). They direct the flow within an executing program. They make it easy to repeat or skip a group of commands during program execution. When you select an item from the menu, the name is copied to the cursor location. PRGM CTL Menu CTL I/O EXEC 1: If 2: Then 3: Else 4: For( 5: While 6: Repeat 7: End 8: Pause 9: Lbl 0: Goto A: IS>( B: DS

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Programming
13-7
PRGM CTL (Control) Instructions
The PRGM CTL (program control) instructions can be accessed only from within
the program editor (press
±
). They direct the flow within an executing
program. They make it easy to repeat or skip a group of commands during
program execution. When you select an item from the menu, the name is copied
to the cursor location.
PRGM CTL Menu
CTL I/O EXEC
1:If
Create conditional test.
2:Then
Used with
If
.
3:Else
Used with
If-Then
.
4:For(
Create incrementing loop.
5:While
Create conditional loop.
6:Repeat
Create conditional loop.
7:End
Signifies end of loop,
If-Then
, or
Else
.
8:Pause
Pause program execution.
9:Lbl
Define a label.
0:Goto
Go to a label.
A:IS>(
Increment and skip if greater than.
B:DS<(
Decrement and skip if less than.
C:Menu(
Define menu items and branches.
D:prgm
Execute a program as a subroutine.
E:Return
Return from a subroutine.
F:Stop
Stops execution.
Controlling Program Flow
Program control instructions tell the TI
.
82 which command to execute next
in a program.
If
,
While
, and
Repeat
check a
condition
that you define to
determine what command to execute next.
condition
frequently uses
relational or Boolean tests (Chapter 2) such as
If A<7:A+1
!
A
or
If N=1 and M=1:Goto Z
.
If
If
is used for testing and branching. If
condition
is false (zero), then the
command immediately following it is skipped. If
condition
is true
(nonzero), that command is executed.
If
instructions can be nested.
:If
condition
:
command if true
:
command