Data types

 Hi! Today I am going to talk about data types. I hope this will help you with your learning because they are one of the most important things in programming if not the most important.

Data types refer to an extensive system used for declaring variables or functions of different types. The Type of a variable determines how much space it occupies and how the bit pattern stored is interpreted

The data types can be classified as follows :

Types & Description
Basic Types

They are arithmetic types and are further classified into: (a) integer types and (b) floating-point types.

Enumerated types

They are again arithmetic types and they are used to define variables that can only assign certain discrete integer values throughout the program.

The type void

The type specifier void indicates that no value is available.

Derived types

They include (a) Pointer types, (b) Array types, (c) Structure types, (d) Union types and (e) Function types.

The array types and structure types are referred collectively as the aggregate types. The type of a functions specifies the type of the function’s return value.

Integer Types

The following table provides the details of standard integer types with their storage sizes and value ranges −

Type Storage size Value range
char 1 byte -128 to 127 or 0 to 255
unsigned char 1 byte 0 to 255
signed char 1 byte -128 to 127
int 2 or 4 bytes -32,768 to 32,767 or -2,147,483,648 to 2,147,483,647
unsigned int 2 or 4 bytes 0 to 65,535 or 0 to 4,294,967,295
short 2 bytes -32,768 to 32,767
unsigned short 2 bytes 0 to 65,535
long 4 bytes -2,147,483,648 to 2,147,483,647
unsigned long 4 bytes 0 to 4,294,967,295

Floating-Point type

 Type Storage size Value range Precision
float 4 byte 1.2E-38 to 3.4E+38 6 decimal places
double 8 byte 2.3E-308 to 1.7E+308 15 decimal places
long double 10 byte 3.4E-4932 to 1.1E+4932 19 decimal places

Keep on coding! 😉

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