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All smallest individuals unit of c is called C tokens.

There are 5 types of C tokens :

  1. Variable
  2. Constant
  3. Keywords
  4. Operators
  5. Identifiers

Variable : It is a Memory allocation which has a data type and specific range used to store a value which can frequently modified during the program execution. To declare a variable we need data types.

C provides three basic data type:

  1. Integer
  2. Float
  3. Character

Integer : It is used to store numeric value with any decimal places. It has three types :

Integer-types in C token

Float : Float is a variable is used to store decimal value. It has also three types :

float-types

Charter Variable : It is used to store single character. If text one byte allocation and keyword is used char.

character –> char —> 1 byte —> single character

Note: || Memory allocation for integer Variable is sometimes depends on the machine architecture. some higher configuration machine allocated two byte memory for short and four byte memory for end.

Note : || C follows the concept of signed and unsigned for integer variable. every declared variable is signed by default. although we can used a keyword signed if a variable is declared as signed , it can hold positive values as well as negative values. if we want to restrict a variable , we can declared it unsigned.

The Another advantage using unsigned int is that we will get double range in positive size.

Constant : Constant is also a memory allocation used to store a value but it can’t modify during the program execution.

There are two types if constants

  1. Variable Constant
  2. Symbolic Constant

Variable Constant : If we declare a variable as a constant using a keyword constant, it is called variables constant.

Example : int a= 50

a=a+ -> 60

Symbolic Constant : It is more powerful and flexible than variable constant. to declare symbolic constant, we used defined statement also called macro.

General format : #define constantName value

Example : #define N 100

Identifier : It is used to give the name of variable constant or any other user defined object. Identifiers may be combination of alphabets, digits and special symbol underscore(_) but it can’t begin with digits.

Example : int A

Keywords : Keyword are the reserve words of an Programming language which has certain meaning in that programming language. Although we can use any keyword in the program but we can’t re-define it.

C Provides 32Keyword of Programming:

c-keywords

Operators : Operators are mode or symbol to do some operation or the operand.

Cprovides 8 types of Operators:

  1. Arithmetic Operators
  2. Assignment Operators
  3. Relational operators
  4. Increment or decrement operators
  5. Logical Operators
  6. Conditional Operators
  7. Bitwise Operators
  8. Special Operators

Arithmetic Operators : It is used to perform some basic arithmetic operations like add, sub, etc.

Example : +, -, /, %, *, ++, —

Assignment Operators : It is used to assign a new value to the variable or change the existing value of variable. = is known as assignment operator.

Example : a=50

We can also combine the arithmetic operators and assignment operators to get a new operators called as arithmetic assignment operator or short hand operator.

Example : +=, -=, *=, /=, %=

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