C Programming Language Class 3 : C Data Types

C Programming Language Class 3 : C Data Types

Data types in any of the language means that what are the various type of data the variables can have in that particular language. Whenever a variable is declared it becomes necessary to define data type that what will be the type of data that variable can hold.
Mainly there are two types of data types:
1. Primary Data Type
2. Secondary Data Type
Primary Data Type : character, integer, float, double, void
Secondary Data Type : arrays, pointer, structures, union, enum

C data types

C language also supports the wide range of data type like :

Data type	Keyword	Bits	Range
integer	int	16	-32768 to 32767
long integer	long	32	-4294967296 to 4294967295
short integer	short	8	-128 to 127
unsigned integer	unsigned	16	0 to 65535
character	char	8	0 to 255
floating point	float	32	approximately 6 digits of precision
double floating point	double	64	approximately 12 digits of precision

The data type can also be of signed & unsigned. If the unsigned notation is used then the range becomes just double. The long, signed & unsigned notations are also called qualities.
Sample Data types program :

// data types program example

#include

using namespace std;

int main()

{

int a = 3000; // positive integer data type

float b = 4.5345; // float data type

char c = 'A'; // char data type

long d = 31456; // long positive integer data type

long e = -31456; // long -ve integer data type

int f = -145; // -ve integer data type

short g = 120; // short +ve integer data type

short h = -120; // short -ve integer data type

double i = 5.1234567890; // double float data type

float j = -3.24; // float data type

}

Enum Data Type

This is an user defined data type having finite set of enumeration constants. The keyword ‘enum‘ is used to create enumerated data type.
Syntax:
enum [data_type] {const1, const2, …., const n};
Example Code:

enum mca(software, internet, seo);

Typedef

It is used to create new data type. But it is commonly used to change existing data type with another name.
Syntax:
typedef [data_type] synonym;
OR typedef [data_type] new_data_type;
Example Code:

typedef int integer;

integer rollno;

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