Pour les articles homonymes, voir Affectation.
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En algorithmique et en programmation informatique, une affectation, aussi appelée assignation par anglicisme, est une structure qui permet d'attribuer une valeur à une variable.
Il s'agit d'une structure particulièrement courante en programmation impérative, et dispose souvent pour cette raison d'une notation courte et infixée, comme x = expr ou x := expr. Dans certains langages, le symbole est considéré comme un opérateur d'affectation, et la structure entière peut alors être utilisée comme une expression. D'autres langages considèrent une affectation comme une instruction et ne permettent pas cet usage.
x = expr
x := expr
La structure d'affectation est le plus souvent notée x = expr ou x := expr.
x=expr
D'autres langages utilisent une notation en forme de flèche ou un mot-clé.
x <- expr
x <<- expr
assign("x", expr)
x ← expr
x =: expr
let x = expr
LET x = expr
let x := expr
set x to expr
set x = expr
Set-Variable x (expr)
x : expr
Certains langages placent l'expression à gauche de l'opérateur, et l'identificateur à droite.
MOVE expr TO x
expr → x
expr -> x
put expr into x
Certains langages, comme Lisp[8],[9] ou Tcl, utilisent une notation préfixée.
(setf x expr)
(set! x expr)
set x expr
expr x !
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