Data Types in C Programming

C language is rich in its data types. C supports several different types of data, each of which may be represented differently within the computer memory. There are three cases of data types:

1. Basic data types (Primary or Fundamental) e.g.int, char

2. Derived data types e.g. array, pointer, function

3. User defined data types e.g. structure, union, enum

The basic data types are also k/a built in data types. The basic data types are listed below. Typical memory requirements are also given:

Data Types Description Typical Memory Requirement

char single character 1 byte

int integer quantity 2 bytes

float floating-point number 4 bytes (1 word)

double double-precision floating point number 8 bytes (2 word)

In order to provide some control over the range of numbers and storage space, C has following classes: signed, unsigned, short, and long.

Types Size

char or signed char 1 byte

unsigned char 1 byte

int 2 bytes

short int 1 byte

unsigned short int 1 byte

signed int 2 bytes

unsigned int 2 bytes

long int 4 bytes

signed long int 4 bytes

unsigned long int 4 bytes

float 4 bytes

double 8 bytes

long double 10 bytes

void is also a built-in data type used to specify the type of function. The void type has no values.

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