Data type is a keyword. It decide size of data in C/C++ programming which type of data can be stored in program.
In C/C++ all the data must be stored in the variable. There are different types of data so it is necessary to specify which type of data the variable should store to perform the data type having provided.
Table of Contents
Data Types in C Programming
There are three types of data
- Built-in Data types
- User-defined Data types
- Derived- Data types
1. Built-in/Predefined Data types:-
- Such type of data type is already defined in the C Compiler.
EX:-int, float, char
2. User-defined Data types:-
- Such type of data type which defined by a programmer for a specific purpose.
Ex:- Union, Structure, enum
3. Derived- Data types:-
- Such type of data type which is defined derived from the primitive or built-in data types are called derived data type.
EX:- Array, Function, Pointer
1. Built-in/Predefined/Basic Data types in C Programming
There are four types of Basic data types
1. Character Data Type
- It is declared such type of variable which contains character type of data.
- Any single symbol written in a single code is called a character.
- EX:-cse study
| Memory size | 1 byte(8 bit) |
| Range | 27 to 27-1 |
| Decimal value | -128 to 127 |
| Format specifier | %c and %s Where %s is used for string |
| unsigned int | 0 to 255 |
2. Integer Data Type
- It is declared as such type of variable that contains an integer type of data.
- It is used to store the whole number.
| Memory size | 2 byte(16 bit) |
| Range | 215 to 215-1 |
| Decimal value | -32768 to 32767 |
| Format specifier | %d |
| unsigned int | 0 to 65535 |
3. Float Data Type
- Float refers floating point or real number.
- A float number using 6 decimal digit
- EX:-24.234454
| Memory size | 4 byte(32 bit) |
| Range | 231 to 231-1 |
| Decimal value | 3.4e-38 to 3.4e38 |
| Format specifier | %f |
4. Double Data Type
- Double also refers floating point and real numbers.
- A double data type use 12 decimal digits.
- EX:-2.563464575500
| Memory size | 8 byte(64 bit) |
| Range | 263 to 263-1 |
| Decimal value | 1.7e-308 to 1.7e308 |
| Format specifier | %lf |
Summary of Data Type in C Programming
| Data Type | Memory Size | Range | Decimal Value | Format Specifier | Value |
|---|---|---|---|---|---|
| char | 1 BYTE (8 Bit) | 27 to 27-1 | -128 to 127 | %c /%s | 0 to 255 |
| int | 2 BYTE (16 Bit) | 215 to 215-1 | -32768 to 32767 | %d | 0 to 65535 |
| float | 4 BYTE (32 Bit) | 231 to 231-1 | 3.4e-38 to 3.4e38 | %f | |
| double | 8 BYTE (64 Bit) | 263 to 263-1 | 1.7e-308 to 1.7e308 | %lf |