C Programming - Variables And Constants - Data Types

Data Types

• DataTypes are used for declaring variables And functions of different types.
• When Program store data in variables, It is necessary that each variable must be assigned a specific data type.

Following are the list of Data Types in C :

 

No.	Keyword	Memory	Range
1.	char or signed char	1 Byte	-128 to 127
2.	unsigned char	1 Byte	0 to 255
3.	int or signed int	2 Byte	-32,768 - 32,767
4.	unsigned int	2 Byte	0 to 65535
5.	short int or signed short int	1 Byte	-128 to 127
6.	unsigned short int	1 Byte	0 to 255
7.	long or signed long	4 Bytes	-2,147,483,648 to 2,147,483,647
8.	unsigned long	4 Bytes	0 to 4,294,967,295
9.	float	4 Bytes	3.4E - 38 to 3.4E + 38
10.	double	8 Byte	1.7E - 308 to 1.7E + 308
11.	long double	10 Bytes	3.4E-4932 to 1.1E + 4932

 

Declaration of variable :

main()
{
    /* declaration */

    //long int is datatype and amount is variable name
    long int amount;

    //int is datatype and code is variable name
    int code;

    char c;

    double average;

    float x,y;

}