fn: -=
[contents]

Contents

Syntax

The syntax for -= calls is:

f++:  
-=(params)

n++:  
@-=(params)

Description

-= is the arithmetic assignment operator for subtraction, it takes $n \geq 2$ input parameters $p_1, \ldots, p_n$ where $p_1$ should be a variable name and the remainder should all be numbers, it sets $p_1 = p_2 - \ldots - p_n$ performed from left to right. For example, $-=(p_1, p_2, p_3, p_4) \Leftrightarrow p_1 = p_2 - p_3 - p_4 = (p_2 - p_3) - p_4$.

Note: It is typically faster to use exprtk for arithmetic assignment operators, plus the syntax is nicer.

f++ example

Example of -= being used with f++:

:=(int, a=13, b=10)
-=(a, b, 8)
console(a)

n++ example

Example of -= being used with n++:

@:=(int, a=13, b=10)
@-=(a, b, 8)
@console(a)

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