In this article Data type in C we give the information about fundamental data type in C like int, char, float, double and void.
Data Type in C:
C language is huge & more in its data types.
There are three types of data types supported by ANSI C.
1. Primary data types.
2. Derived data types.
3. User-defined data types
All C compilers mostly support or handled five fundamental data types, namely integer (int), character (char), floating point (float), double-precision floating point (double) and void.
| Data Type | Keyword | Bytes Required | Range | Format |
| Character(Signed) | char | 1 | -128 to +128 | %c |
| Integer(signed) | int | 2 | -32768 to +32767 | %d |
| Float(signed) | float | 4 | -3.8e38 to +3.4e38 | %f |
| Double | double | 8 | -1.7e308 to +1.7e308 | %lf |
| Long integer (signed) | long | 4 | 2,147,483,648 to 2,147,438,647 | %ld |
| Character(unsigned) | Unsigned char | 1 | 0 to 255 | %c |
| Integer (Unsigned) | Unsigned int | 2 | 0 to 65535 | %u |
| Unsigned long integer | Unsigned long | 4 | 0 to 4,294,967,295 | %iu |
| Long double | Long double | 10 | -1.7e932 to +1.7e932 | %Lf |
Variable in C:-
Definition:- “A variable is a data name that may be used to store a data value.”
- An important benefit of the variable is take different values at different times during execution.
- A variable name can be select by the programmer in a meaningful way so the advantages of variable as to reflect its function or nature in the program.
Rules for Declaring Variables:-
- Variable names consist only letters, digits and the underscore(_) character.
- They must begin with a letter but some situation or systems permit underscore as the first character.
- Length should not be normally more than eight characters.
- Uppercase and lowercase are significant. that is, the variable Sum is not same as total or SUM
- It should not be a keyword.
- White space is not allowed.
Some examples of valid variable names are: Rajveer, rahul, neeta, n1, tot, Sum_num etc.
Invalid examples include: 123, % , char, 25th etc.
Declare Variable in C:
Syntax:
data_type variable_name;
Ex. int n1;
Initialize variable in C:
Syntax:
data_type variable_name= value;
Ex. int n1=10;
Some More:
POP- Introduction to Programming Using ‘C’
OOP – Object Oriented Programming
DBMS – Database Management System
RDBMS – Relational Database Management System
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