Subtract '-', '-='
The Subtract operator subtracts two values. Subtract can be used in both variable and constant expressions. Example:
X := Y - 5
Subtract has an assignment form, -=, that uses the variable to its left as both the first operand and the result destination. For example,
X -= 10'Short form of X := X - 10
Here, 10 is subtracted from the value of X and the result is stored back in X. The assignment form of subtract may also be used within expressions for intermediate results; see Intermediate Assignments.
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