IAI America PSEL - Manual (Page 90)

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Part 2 Programs
1.5 Variables
(1) Meaning of variable
“Variable” is a technical term used in software programming. Simply put, it means “a box in which a value
is put.” Variables can be used in many ways, such as putting in or taking out a value and performing
addition or subtraction.
Command Operand 1 Operand 2
ADD 1 1
If this command is applied to variable box 1, which already contains 2, then 1 will be added to the current
value and 3 will result.
Variable
box 1
A variable can be used in many ways, such as:
Putting in a value (1234),
Taking out a value (456), or
Adding a value (+1).
Variable
box 1
1 is added.
(Already contains 2)