Data types in c programming language

Data types in c programming language

Data types in c programming language

DATA TYPES

The data type defines the type Of data stored in a memory-location and allocates memory for the data.

The number of bytes allocated is based on the architecture of the machine.

C supports three classes Of data types:

1. Primitive data type

Example: int, float, char, double, void

2. Derived data types

Example: signed, unsigned

3. User-defined data types

Example: structure

Data Type C

1. The primitive data type ( also known as primary or basic data type )

Example: int, float, char, double, void

1.  int (integer)

• An int is a keyword which is used to define integers.
• Using int keyword, the programmer can inform the compiler that the data associated with this keyword should be treated as an integer.
• An integer is used to store the whole number with the range Of values supported by a particular machine.
• Generally, integer occupies one word Of storage of machine which generally Varies.(i.e. 16 or 32).
• C supports three different sizes Of integer as shown in figure 2.5

1. short int (2 bytes)
2. .int (4 bytes)
3. long int (8 bytes)

int-in-c

2.   float (floating point)

• A float is a keyword which is used to define floating-point numbers.
• It allocates 4 bytes of memory Out of which 6 digit precision is provided.

3.   double (floating-point double precision)

•   A double is a keyword used to define long floating-point numbers.
•   It allocates 8 bytes of memory Out of which 14 digit precision is provided.
•   The long double allocates 16 bytes in which it has 80 bits precision.
•   The floating-point supports both types Of values storage i.e. fractional values and scientific value.

float

4. char (Character)

• A char is a keyword which is used to define a single character.
• One byte Of memory is allocated by char.
• Similar to integer char also comes with signed and unsigned versions.

5. Void

•  void is an empty data type. Since no value is associated with this data type, but it allocates one byte in the memory.
•   This is normally used in functions to indicate that the function does not return any value.
•   It can also play a role Of a generic type in C, i.e. which can represent any of the Other standard types.

A simple program example which illustrates the number Of bytes allocated for basic data type in 32 bit machine.

# include<stdio.h>  

void main ( )

{

          print f (" * * *  *The Number of bytes allocated for primary

Data Type in c

• Derived Data type and User define data types are data type which is derived from primitive data type or basic data type.

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