Keywords and identifiers
In C programming language, keywords and identifiers are built-in fundamental programming concepts. Keywords and identifiers in C language are used to declare the names of program variables, program functions, and other C program variable elements.
Keywords and Identifiers Declaration Method in C Language.
Keywords in C Language.
Keywords, also known as reserved words in C programming, are built-in reserved words in C language that have special programming meanings and purposes. These words are reserved by the C language for programming purposes, and cannot be used for any other programming coding purpose, such as naming variables or functions in C language.
Some of the major common reserved keywords in C programming include.
int
float
char
for
do while
while
if
else
for
while
return
break
continue
Reserved keywords in C language are not used as program variable names or identifiers, reserved words in C are stored to serve pre-defined programming purposes, and if you use them incorrectly, the result will be an error in program compilation.
Identifiers in C Language.
Program identifiers in C language are program variable names given to various program elements, such as program variables, functions, arrays, pointers, structures, etc. C program identifiers provide a way to refer to these elements within the program. Unlike C program keywords, program identifiers are defined by the programmer and each identifier can differ from each other in length and structure subject to certain rules.
Rules for Naming Identifiers in C Language.
Identifiers in C language can contain characters (both uppercase and lowercase), decimals, and underscores _ Declaration Method.
The first character of any declared identifier must be a letter or an underscore.
Declared identifiers must be case-sensitive.
Always remember that identifiers are not the same as reserved keywords in C programs.
No special characters (except underscore) or spaces are allowed in the declaration of identifiers.
Examples of valid identifiers in C language.
textMe
counter
Decimal_Value
Maxvalue
_integer
Some examples of invalid identifiers in C language.
9decimal (invalid declaration because it starts with a digit)
while (it is a reserved keyword)
@value (declared with a special symbol)
char my name (there is space between the declared variable)
Use of Identifiers in C Language.
Identifiers are important elements in C programming for naming variable, function and other C program elements declaration, which makes the existing program source code more simple readable and understandable. Choosing meaningful and descriptive names for identifiers in the C language can greatly improve the clarity and maintainability of the program code.
Finally, keywords like for and while, if etc. are reserved words with special meaning in C programming, identifiers are user defined declared program variable names in C language which are used by C programmers to represent various program elements. The difference between keywords and identifiers in C language can be understood to write clear and error-free C code.
