IAI America PSEL - Manual (Page 206)

196
Part 2 Programs
 WH (Select if true; variable)
Command, declaration
Extension condition
(LD, A, O, AB, OB)
Input condition
(I/O, flag)
Command,
declaration
Operand 1 Operand 2
Output
(Output, flag)
Prohibited Prohibited WH

Variable
number
Data CP
[Function] This command is used between SLCT and EDSL commands to execute the subsequent
commands up to the next W  command or an OTHE or EDSL command when the
comparison result of the content of the variable specified in operand 1 with the value specified
in operand 2 satisfies the condition.
WH 
EQ Operand 1 = Operand 2
NE Operand 1
 Operand 2
GT Operand 1 > Operand 2
GE Operand 1
 Operand 2
LT Operand 1 < Operand 2
LE Operand 1
 Operand 2
[Example 1] LET 1 20 Assign 20 to variable 1.
LET 2 10 Assign 10 to variable 2.
:
SLCT Execute multi-branching.
WHEQ 1 10
:
(1)
(1) will be executed if the content of variable 1 is 10.
Since variable 1 contains 20, however, the next
condition will be referenced.
:
WHGT
:
1 *2 This command will be executed if the content of variable
1 is greater than the content of variable 2.
(2) Since variable 1 (= 20) > variable 2 (=10), (2) will be
executed.
OTHE
:
(3)
This command will be executed if none of the conditions
are satisfied. In this example, since (2) was executed,
(3) will not be executed.
:
EDSL
:
(4)
:
The processing will move here if any of the conditions
were satisfied and the applicable command executed. In
this example, (2) and (4) will be executed.
* If multiple conditions are likely to be satisfied, remember that the first W
 will become valid and any
subsequent commands will not be executed. Therefore, state from the command with the most difficult
condition or highest priority.