Keywords are special words, reserved for the language. It must be composed of alphanumeric characters (all the letters of the alphabet, and the digits 0 to 9) and underscores (_).įirst character of a name must be a letter. A name in Fortran must follow the following rules − IdentifierĪn identifier is a name used to identify a variable, procedure, or any other user-defined item. A token could be a keyword, an identifier, a constant, a string literal, or a symbol. Tokens are made of characters in the basic character set.
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