Tokens in c

What are the tokens in c language?

Tokens are the smallest elements used to build a program in c.

Tokens can be classified into six types. They are as follows:

  • Keywords
  • Constants
  • Identifier
  • strings
  • Special symbols
  • Operaters

Let us see one by one.


Keywords are also known as “Reserved words”. They have special meaning when used in a program.

For example int is a reserved keyword in c which is used to store integer type variable values.

There are total 32 keywords are there in c.

C Keywords are as follows:



Constants are fixed values. Their values can not be altered during execution. Constants are also known as literals.

There can be an integer constant, a floating constant, a character constant.

Types of constants are as follows:

Integer constant

It can be a decimal, hexadecimal, octal constant. A prefix defines the base.


Floating point literals

It can be in decimal form or exponential form. It has an integer part, a decimal point, a fractional part, an exponent part.

For example: 3.14,32E,….

Character constants

The character constant is enclosed in single quotes. It is stored in char type variable.

For example: ‘a’,’\n’,…..

String constants

These are enclosed in double quotes. It contains set of characters.

For example: “scholarsoul”,”1234″,…..


It is a name used to identify a variable, function, structure, array, union….

C Keywords can not be used as identifiers but it can be the part of identifier.

For example: abc, number,….

Rules for naming identifiers in c

  • Identifier must begin with underscore or alphabet.
  • It must not contain whitespace.
  • It should not be a keyword.
  • Special characters are not allowed.


It is a set of characters terminated with a null character.

It is enclosed in a double quotes.

For example:”scholarsoul”, “cprogram”,….

Special symbols

C provides special characters to be used along with letters and numbers.

For example: !,@,#,%,&,*,(,),…..

There are total 30 special characters in c.


These are special symbols used for mathematical operations. Consider two integer variables a and b.

Following are the types of operators

  • Arithmetic operators: C provides arithmetic operators to add, substract, divide, multiply, increment, decrement values. For example: a+b, a-b, a/b,…….
  • Relational operators: It is used to compare two values like >=,<=,==,!=,>,<. For example a>b, a<b,…..
  • Logiacal operators: It is used to compare two values. For example a&&b, a||b, !(a||b).
    i. Logical AND(&&): If both a and b operands is non-zero then result is true otherwise result becomes false.
    ii. Logical OR: If anyone of a and b operands are non-zero then result becomes true.
    iii. Logical NOT: It is used to reverse the logical state of its operand.
  • Bitwise operators: These operators works on bits.
  • Assignment operators: It is used to assign values to variables. example a=0,a+=10,a-=1,a/=10,a*=10.

Truth table

aba & ba | ba ^ b

People also ask for

What are tokens in c?

Tokens are the smallest elements used to build a program in c.

What is keyword in c?

Keywords are also known as “Reserved words”. They have special meaning when used in a program.