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Identifiers are names that are given to various program elements, such as variables, functions and arrays. We can write a function, for example: 

int function (int x);

Here, the parameter of the function is int x.

My question is: can we call the parameter an identifier?

Jonathan Leffler
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    Are you asking if, given the example, `x` is considered an *identifier* ? [The answer is *yes*](http://en.cppreference.com/w/cpp/language/identifiers). – WhozCraig Feb 07 '17 at 09:07
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    http://stackoverflow.com/questions/11439735/what-is-the-difference-between-an-identifier-and-variable – msc Feb 07 '17 at 09:07

2 Answers2

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x identifies a parameter of your function, which can be used as a variable (identifier) in calculations. So yes, x is an identifier.

Paul Ogilvie
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From the c standard

6.4.2 Identifiers

An identifier is a sequence of nondigit characters (including the underscore _, the lowercase and uppercase Latin letters, and other characters) and digits, which designates one or more entities as described in 6.2.1. Lowercase and uppercase letters are distinct. There is no specific limit on the maximum length of an identifier.

Emphasis mine

6.2.1 Scopes of identifiers

1 An identifier can denote an object; a function; a tag or a member of a structure, union, or enumeration; a typedef name; a label name; a macro name; or a macro parameter. The same identifier can denote different entities at different points in the program. A member of an enumeration is called an enumeration constant. Macro names and macro parameters are not considered further here, because prior to the semantic phase of program translation any occurrences of macro names in the source file are replaced by the preprocessing token sequences that constitute their macro definitions. [...]

Emphasis mine

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