C character set and keywords

C language consists of some basic elements which are used to construct simple C statements. These elements include the C character set, identifiers, and keywords, data types, constants, variables and arrays, declaration, expressions and statements. We will see how these basic elements can be combined to form more comprehensive program components.

Identifiers are names that are given to various program elements, such as variable, functions and arrays. Identifiers consist of letters and digits, in any order, except that the first character must be a letter.; Both upper- and lowercase letters are permitted, though common usage favors the use of lowercase letters for most types of identifiers. …

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