Tokens in C language

Categories: C language

Tokens in C is the most important element to be used in creating a program in C. We can define the token as the smallest individual element in C. For `example, we cannot create a sentence without using words; similarly, we cannot create a program in C without using tokens in C. Therefore, we can say that tokens in C is the building block or the basic component for creating a program in C language.


Classification in C Language

1. Keywords in C

2. Identifiers in C

3. Strings in C

4. Operators in C

5. Constant in C

6. Special Characters in C


Keywords in C

Keywords in C can be defined as the pre-defined or the reserved words having its own importance, and each keyword has its own functionality. Since keywords are the pre-defined words used by the compiler, so they cannot be used as the variable names. If the keywords are used as the variable names, it means that we are assigning a different meaning to the keyword, which is not allowed. C language supports 32 keywords given below:

autodoubleintstruct

breakelselongswitch

caseenumregistertypedef

charexternreturnunion

constfloatshortunsigned

continueforsignedvoid

defaultgotosizeofvolatile

doifstaticwhile


Identifiers in C

Identifiers in C are used for naming variables, functions, arrays, structures, etc. Identifiers in C are the user-defined words. It can be composed of uppercase letters, lowercase letters, underscore, or digits, but the starting letter should be either an underscore or an alphabet. Identifiers cannot be used as keywords. Rules for constructing identifiers in C are given below:

1. The first character of an identifier should be either an alphabet or an underscore, and then it can be followed by any of the character, digit, or underscore.

2. It should not begin with any numerical digit.

3. In identifiers, both uppercase and lowercase letters are distinct. Therefore, we can say that identifiers are case sensitive.

4. Commas or blank spaces cannot be specified within an identifier.

5. Keywords cannot be represented as an identifier.

6. The length of the identifiers should not be more than 31 characters.

7. Identifiers should be written in such a way that it is meaningful, short, and easy to read.


Strings in C

Strings in C are always represented as an array of characters having null character '\0' at the end of the string. This null character denotes the end of the string. Strings in C are enclosed within double quotes, while characters are enclosed within single characters. The size of a string is a number of characters that the string contains.

Now, we describe the strings in different ways:

char a[10] = "javatpoint"; // The compiler allocates the 10 bytes to the 'a' array.

Top Blogs
Passing structure to function in C Language Published at:- Program in C Language with Practical Published at:- Difference between the typedef and the #define in C Published at:- Use of typedef keyword in Structure C Language Published at:- Difference between typedef and define in C Published at:- Function Calling in C Language Published at:- What is the function call in C Language Published at:- What is getch() in C Language Published at:- Enum in C Language Published at:- Differences between Low-Level language and High-Level language Published at:- Differences between Machine-Level language and Assembly language Published at:- What is a programming language in C Language Published at:- Flow of C Program in C Language Published at:- Data Segments in C Language Published at:- Program Structure with “Hello World” Example Published at:- The C Compiler work in C language and its important Published at:- Inception Of C Language Tutorial for Beginners Published at:- C Expressions in C Language Published at:- Command Line Arguments in C Language Published at:- C #pragma in C Language Published at:- C #error in C Language Published at:- C #else in C Language Published at:- C #if in C Language Published at:- C #ifndef in C Language Published at:- C #ifdef in C Language Published at:- C #undef in C Language Published at:- C #define in C Language Published at:- C #include in C Language Published at:- C Predefined Macros in C Language Published at:- C Preprocessor Directives in C Language Published at:- C ftell() function in C Language Published at:- C rewind() function in Language Published at:- C fseek() function in C Language Published at:- C fputs() and fgets() in C Language Published at:- C fputc() and fgetc() in C Language Published at:- C fprintf() and fscanf() in C Language Published at:- File Handling in C Language Published at:- Deciding the size of the union in C Language Published at:- Union in C Language Published at:- Changing order of the variables In C Language Published at:- Why structure padding in C Language Published at:- Structure Padding in C Language Published at:- Types of Nested Structure in C Language Published at:- Nested Structure in C Language Published at:- C Array of Structures Published at:- typedef in C Language Published at:- What is Structure in C Language Published at:- C Structure in C Language Published at:- C Math in C Language Published at:- C String Functions in C Language Published at:- C gets() and puts() functions in C Language Published at:- Pointers with strings in C Language Published at:- Accepting string as the input in C Language Published at:- Traversing String in C Language Published at:- C Strings In C Language Published at:- Dynamic memory allocation in C Language Published at:- Function pointer as argument in C Language Published at:- C Function Pointer in C Language Published at:- What is a Null Pointer in C Language Published at:- C dereference pointer in C Language Published at:- Advantages of void pointer in C Language Published at:- void pointer in C Language Published at:- Pointer to Constant In C Language Published at:- const Pointer in C Language Published at:- sizeof() operator in C Language Published at:- Dangling Pointers in C Language Published at:- Pointer to function in C Language Published at:- Pointer Arithmetic in C Language Published at:- C Double Pointer (Pointer to Pointer) in C Language Published at:- Pointer Arithmetic in C Language Published at:- C Double Pointer (Pointer to Pointer) Published at:- C Pointers in C Language Published at:- Passing Array to Function in C Published at:- What is an Array in C Language Published at:- Two Dimensional Array in C Language Published at:- C Array in C Language Published at:- Storage Classes in C Published at:- Recursive Function In C Language Published at:- Recursion in C Language Published at:- Call by value and Call by reference in C Language Published at:- Types of Functions in C Language Published at:- C Functions Published at:- C goto statement in C Language Published at:- C continue statement in C Language Published at:- C break statement in C Language Published at:- Nested Loops in C Language Published at:- Nested Loops in C Language Published at:- for loop in C Language Published at:- Properties of while loop in C Language Published at:- while loop in C Language Published at:- do while loop in C Published at:- C Loops of C Language Published at:- Difference Between if-else and switch Published at:- C Switch Statement In C Language Published at:- The C Language in the C Control Statement Published at:- What is the 2s complement in C Published at:- Meaning of Bitwise Operator in C Language Published at:- Conditional Operator in C Language Published at:- Differences Between Compile-Time and Runtime In C Language Published at:- Compile time vs Runtime In C language Published at:- Programming Errors in C Language Published at:- Difference in C language Term Published at:- Static in C Language Published at:- Boolean with Logical Operators in C language Published at:- C Boolean in C language Published at:- Operators in C Language Published at:- Tokens in C language Published at:- Constants in C Published at:- What is ASCII code? Published at:- Escape Sequence in C Published at:- C Format Specifier in C Language Published at:- C Operators in c Language Published at:- C Identifiers Published at:- Data Types in C Published at:- Types of Variables in C Language Published at:- Variables in C Language Published at:- printf() and scanf() in C Published at:- Compilation process in c Published at:- How to install C Language Published at:- Features of C Language Published at:- History of C Language Published at:- Definition of C Language Published at:- Introduction to Implementation of Queue using Linked List Published at:- Input and Output Functions in C Published at:- C Character Set Published at:- Importance of C Programming Language Published at:- How does C Programming Language Work Published at:- History of C Language : Introduction to C Programming Language Published at:- Benefits of C language over other programming languages Published at:- C Language Interview Question and Answers Published at:-
R4R.co.in Team
The content on R4R is created by expert teams.