C data types

Data types are keywords which are used to assign a type to a variable. Mainly there are two type of data type

• Basic data type
• Derived data type

Further we can divide basic data type in two categories

• Primary data type

1. int
2. char
3. float
4. double
5. void

• Secondary data type  – which is called modifier also.

1. short
2. long
3. signed
4. unsigned

Secondary data type is used to modified primary data type. See example below

int                                    money;
short  int                         money;
long  int                           money;
signed  char                    alphabet_1;
unsigned short int          balance;

Derived data type are derived from basic data types

1. array
2. pointer
3. structure
4. enumeration

User defined data type are derived from basic data type

Syntax:

typedef data_type new_data_type

Example:-

typedef int own;

int age;            -1

own age;         -2

Here both 1 and 2 declarations are similar.