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Data Types in C Programming

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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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