Difference between revisions of "Exclamation mark"
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In [[C]] and similar computer programming languages, it is used to represent "logical not" and in a pair with an equals sign (=) to represent ''is not equal to'', e.g. {{tt|1=if (a != b)}} means ''if a is not equal to b''.<ref>[http://cermics.enpc.fr/~ts/C/CONCEPT/expressions.html C Operators/Expressions].</ref> | In [[C]] and similar computer programming languages, it is used to represent "logical not" and in a pair with an equals sign (=) to represent ''is not equal to'', e.g. {{tt|1=if (a != b)}} means ''if a is not equal to b''.<ref>[http://cermics.enpc.fr/~ts/C/CONCEPT/expressions.html C Operators/Expressions].</ref> | ||
| + | In mathematics, the exclamation mark is typically used to represent the [[factorial]] of a whole number, n, as n!. | ||
== Reference == | == Reference == | ||
{{reflist}} | {{reflist}} | ||
Revision as of 12:37, December 21, 2008
An exclamation mark or exclamation point (!) is used at the end of a sentence to express surprise, disgust, admiration, etc., or to add emphasis to a command.
In C and similar computer programming languages, it is used to represent "logical not" and in a pair with an equals sign (=) to represent is not equal to, e.g. if (a != b) means if a is not equal to b.[1]
In mathematics, the exclamation mark is typically used to represent the factorial of a whole number, n, as n!.