C++ Identifiers

C++ identifiers are names that identify program elements such as variables using alphabets, numbers, and underscore.

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Here is the list of characters for:

  • Alphabets:
  • Numbers:
  • Underscore:

Any other character from your keyboard that does not fall under the above category is called a special character. The uppercase and lowercase are distinct characters. They have different numeric values according to ASCII standard.

There is no limit for the number of characters used as , but some compiler put limitation by recognizing first characters as name. You should read the compiler documentation to get the information.

Rules for Variable Names

The C++ identifiers are used for variable names. We must learn the rules to give valid names to variables. The names must contain allowed characters.

My_var
Table
S
R
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The above are some valid names.

5chair
speeed$boat
three dimension

The above three variable names are invalid because:

  • variable names cannot begin with a number
  • special characters are not allowed
  • whitespace is not allowed for variable names.

C++ Keywords

Keywords are special identifiers because they are reserved by the compiler. You cannot use them as variable names and they are case sensitive.

Here is a list of C++ keywords.

asmautobreakcasecatchchar
classconstcontinuedefaultdeletedo
doubleelseenumexternfloatfor
friendgotoifinlineintlong
newoperatorprivateprotectedpublicregister
returnshortsignedsize ofstaticstruct
switchtemplatethisthrowtrytypedef
unionunsignedvirtualvoidvolatilewhile

Note that sometimes one or more keywords are used together.

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