In this post of shapes in C, we are going to discuss sixth C tutorial for beginners in which we are going to discuss
about identifiers in C++.
Identifiers are the names of things that appear in programs
such as variables, constants and functions. There are some rules for identifiers in C++ that should be followed otherwise; the compiler would give the
syntax error.
C++ identifiers:
A C++ identifier consists of letters, digits and the
underscore character (_).
Rules:
- The identifier should begin with a letter or underscore.
- It should not start with a digit.
- There should be no spaces between an identifier
- No other symbols are allowed to write an identifier other than digits, letters and underscore.
Example of illegal identifiers:
- My Book There is a space between My and book
- 1stbook The identifier is starting with a digit
- One+two The symbol ‘+’ can’t be used
- Party! The symbol ‘!’ can’t be used
Example of legal identifiers:
- Book1 Here the digit is not used in the start
- _size The identifier is started with underscore
- Mybook The identifier is started with an alphabet
- Your_book The identifier has two words which are separated by underscore
Types:
There are two types of identifiers:
- Predefined
- User defined
Example:
cout and cin is a predefined identifier whereas num and word is a user defined identifier.
Note: In C++, identifiers can be of any length.
Caution: Identifiers are case sensitive. Uppercase and
lowercase letters are considered different. So the identifier UPPER is not the
same as the identifier upper.
Final Words:
In this c tutorial for beginners of shapes in c, you have learnt the meaning,
use and rules of identifiers. In this c tutorial for beginner, we discussed the
topic of C++ identifiers types, cautions, important notes and
illegal and legal
identifiers with examples and its explanation in detail.This c
programming tutorial has been designed keeping in mind the beginners in
C++.
