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Showing posts with label The Identifier of Programming Language C. Show all posts
Showing posts with label The Identifier of Programming Language C. Show all posts

The Identifier of Programming Language C

Letter :  L =  a + b + c + ................... + A + B + ................... + Z
Digit   : d  =  0 + 1 + 2 + ..................................+9

An Identifier in the C programming language is any string of length 1 or more that contains only letter, digit and underscore ( _ )  and begin with a letter or underscore. Therefore the regular expression for the language  of all C identifier is

(L + _ ) (L+d+_)*

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