Infix notation

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Infix notation is the common arithmetic and logical formula notation, in which operators are written infix-style between the operands they act on (e.g. 2 + 2).


Infix notation is more difficult to parse by computers than prefix notation ( e.g. + 2 2 ) or postfix notation ( e.g. 2 2 + ). However many programming languages use it due to its familiarity. It is more used in arithmetic, e.g. 2+2, 5×6.[1]

Order of operations[edit]

In infix notation, unlike in prefix or postfix notations, parentheses surrounding groups of operands and operators are necessary to indicate the intended order in which operations are to be performed. In the absence of parentheses, certain precedence rules determine the order of operations.

Further notations[edit]

Infix notation may also be distinguished from function notation, where the name of a function suggests a particular operation, and its arguments are the operands. An example of such a function notation would be S(1,3) in which the function S denotes addition: S(1,3) = 1+3 = 4.

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