Texas Instruments TI-82 STATS Manual Book page 307

If
If.Then
Use for testing and branching. If condition is false (zero), then
If
the command immediately following
true (nonzero), then the next command is executed.
instructions can be nested.
condition
:If
command (if true)
:
command
:
Program
following an
Then
is true (nonzero).
End
commands.
condition
:If
:Then
command (if true)
:
command (if true)
:
:End
command
:
Program
Output
executes a group of commands if condition
If
identifies the end of the group of
Output
is skipped. If condition is
If
If
Programming 16–9