Question

\[\large\underline{\textbf{Addition-Assignment}}\]

Answer 1

The `=` symbol in computer science is slightly different to the \(=\) symbol of mathematics.

`=` represents the assignment operator, a (perhaps temporary) definition.
In mathematics, assignment is often denoted with \(:=\).

When a variable is to be reassigned to a value that is:
the old value of the variable plus some additional term; \(x := x + a\)
In computer science this is written as: `x = x + a`,
or using a simpler syntax, (where `+=` denotes addition-assignment): `x += a`.

\(\underline{\text{My question is:}}\)

\(\textit{What is the best way to represent this addition-assignment in }\LaTeX\)?

[I don't think \(x :+= a\) looks right at all]

Answer 2

\[\huge\color{green}{+=}\]:P

Answer 3

but, there is too much space between the chars

Answer 4

i want something more like:\[\large x:\!\!\!+\!\!\!=a\]

Answer 5

don't u like space between numbers variables :P

Answer 6

it should look like the addition-assignment is a single symbol

Answer 7

\(\large\color{green}{{\rm -=+}}\) is it right ? :D

Answer 8

no?

Answer 9

question mark lol okay

Answer 10

maybe
\[\large x \operatorname{:\!\!\!+} a\]

Answer 11

So use of negative space? \(\large x:\!\!\!+\!\!\!=a\) seems a bit tight.

\(\large x:\!\!+\!\!=a\) One less on both sides.
\(\large x:\!\!+\!\!\!=a\) One less on the left.
\(\large x:\!\!\!+\!\!=a\) One left on the right.

Answer 12

first one looks right

Answer 13

\[x\operatorname{:\!\!+\!\!=}a\]\[x\operatorname{:\!\!-\!\!=}a\]\[x\operatorname{:\!\!\times\!\!=}a\]\[x\operatorname{:\!\!\div\!\!=}a\]
hmmm

Answer 14

\[\boxed{
\newcommand \peq {\operatorname{\mathop{:=}^+}} % += addition assignment
\newcommand \teq {\operatorname{\mathop{:=}^-}} % -= take-away assignment
\newcommand \meq {\operatorname{\mathop{:=}^\times}}% *= multiplication assignment
\newcommand \deq {\operatorname{\mathop{:=}^\div}} % /= division assignment
}%unk\]\[
x := x+a\iff x\peq a\\[3ex]
x := x-a\iff x\teq a\\[3ex]
x := x\times a\iff x\meq a\\[3ex]
x := x/a\iff x\deq a\]

Answer 15

So that:
\[\texttt{x = x + 1}\\
\texttt{x += 1}\\
\texttt{x++}\]
performs the mathematical operation:
\[x:=x+1\\
x\peq 1\\
\newcommand \pp {\!+\!\!+} % ++ plus-plus
x\pp\]