Contents

• Syntax
• Description
• f++ example
• n++ example

Syntax

The syntax for -= calls is:

-=(params)

@-=(params)

Description

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

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)