keywords and identifier

Keywords and identifiers in the C programming language are fundamental concepts, and their definitions are not copyrighted. Here's a summary of C keywords and identifiers:

1. Keywords: Keywords are reserved words in C that have specific meanings and functionalities. They cannot be used as identifiers (variable names, function names, etc.) in the program. Here are the C keywords:

There are 32 keywords in C Programming

auto ,break, case, char, const,

continue, default do, double, else,

enum, extern, float, for goto,

if, inline, int long, register,

restrict, return, short, signed,, sizeof,

static, struct, switch, typedef, union,

unsigned, void, volatile, while,

_Bool, _Complex, _Imaginary,

2.Identifiers: Identifiers are names used for variables, functions, labels, and other user-defined entitie in the C program. They must follow specific rules:

The first character must be an alphabet letter (uppercase or lowercase) or an underscore _.

After the first character, an identifier can consist of letters, digits, and underscores.

Example :

count
_myVar
temp123
result

It's important to note that C is case-sensitive, so myVar and myvar would be considered two different identifiers.

Here's an example of using a keyword and an identifier in a C program:

            
            #include <stdio.h>
            int main() { 
            int number = 42; // 'int' is a keyword, 'number' is an identifier 
            printf("The number is %d.\n", number);
            return 0;
            } 
                
            
        

In this example, int is a keyword that indicates the data type of the variable number, and number is an identifier representing a variable storing the value 42.