Explain all user defined data type available in c in detail
Answers
data-type in C programming is a set of values and is determined to act on those values. C provides various types of data-types which allow the programmer to select the appropriate type for the variable to set its value.
The data-type in a programming language is the collection of data with values having fixed meaning as well as characteristics. Some of them are an integer, floating point, character, etc. Usually, programming languages specify the range values for given data-type.
C Data Types are used to:
Identify the type of a variable when it declared.
Identify the type of the return value of a function.
Identify the type of a parameter expected by a function.
ANSI C provides three types of data types:
Primary(Built-in) Data Types:
void, int, char, double and float.
Derived Data Types:
Array, References, and Pointers.
User Defined Data Types:
Structure, Union, and Enumeration.
Every C compiler supports five primary
data types:
void As the name suggests, it holds no value and is generally used for specifying the type of function or what it returns. If the function has a void type, it means that the function will not return any value.
int Used to denote an integer type.
char Used to denote a character type.
float, double Used to denote a floating point type.
int *, float *, char * Used to denote a pointer type.
Three more data types have been added in C99:
_Bool
_Complex
_Imaginary
After taking suitable variable names, they need to be assigned with a data type. This is how the data types are used along with variables:
int age;
char letter;
float height, width;
C supports three derived data types:
Data Types Description
Arrays Arrays are sequences of data items having homogeneous values. They have adjacent memory locations to store values.
References Function pointers allow referencing functions with a particular signature.
Pointers These are powerful C features which are used to access the memory and deal with their addresses.
C allows the feature called type definition which allows programmers to define their identifier that would represent an existing data type. There are three such types:
Data Types Description
Structure It is a package of variables of different types under a single name. This is done to handle data efficiently. "struct" keyword is used to define a structure.
Union These allow storing various data types in the same memory location. Programmers can define a union with different members, but only a single member can contain a value at a given time. It is used for
Enum Enumeration is a special data type that consists of integral constants, and each of them is assigned with a specific name. "enum" keyword is used to define the enumerated data type.
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