Find the Frequency of Characters in a String. C Keywords and Identifiers In this tutorial, you will learn about keywords; reserved words in C programming that are part of the syntax. Character set A character set is a set of alphabets, letters and some special characters that are valid in C language. Alphabets Uppercase: A B C X Y Z Lowercase: a b c C Keywords Keywords are predefined, reserved words used in programming that have special meanings to the compiler.
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By clicking sign up, you agree to receive emails from Techopedia and agree to our Terms of Use and Privacy Policy. An identifier, in C , is the user-defined name of a program element. It can be a namespace, class, method, variable or interface. Identifiers are symbols used to uniquely identify a program element in the code. They are also used to refer to types, constants, macros and parameters. An identifier name should indicate the meaning and usage of the element being referred. Hence, keywords cannot be used as a variable name or a function name in short as an Identifier because that would try to change the existing meaning of the keyword, which is not allowed.
You cannot use Keywords as Identifiers. This means you cannot name your variable, function, structure or pointer, or anything else, using a keyword. All these keywords were defined in the C89 standard, which was the first version of the C language , while some more keywords were added in the later C99 standard.
We will learn most of them as we progress in this tutorial. Keywords must be written in lower case. Apart from some C99 based keywords, all other keywords are in lowercase. Keywords hold special meaning for the C compiler, so respect that, otherwise you will get a compile-time error. The main is not a keyword, but you should treat it as a keyword only.
Because this function is a special function. If you name any variable as main , you may confuse the Compiler. In the C language identifiers are the names given to variables, constants, functions , structures , pointers , or any other user-defined data, to identify them. Because it's up to the user to define the Identifiers, hence there are some rules that one has to follow, which are defined by the C language, to avoid unnecessary errors in the compiler.
Identifiers are case-sensitive in the C language. For example, name and Name will be treated as two different identifiers. No special characters , such as a semicolon , period , whitespaces , slash , or comma are permitted to be used in or as an Identifier.
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