Datatype

Question & Answer

1.Types of DataTypes in C?

Primitive data type

Derived data type

User defined data type

Primitive data type

                char, int, float, double

Derived data type

                signed/unsigned char, signed/unsigned int, signed/unsigned long, long double

User defined data type

                structure, union, Enum, array

2. What is range of data types in c? How to find it? 

Below range & format specifier are based on 32 bit gcc compiler.

 

DATA TYPE	MEMORY (BYTES)	RANGE	FORMAT SPECIFIER
signed char	1	-128 to 127	%c
unsigned char	1	0 to 255	%c
short int	2	-32,768 to 32,767	%d
unsigned short int	2	0 to 65,535	%u
unsigned int	4	0 to 4,294,967,295	%u
int	4	-2,147,483,648 to 2,147,483,647	%d
float	4	1.2E-38 to 3.4E+38	%f
double	8	2.3E-308 to 1.7E+308	%lf

To Find:

            For signed data types, 

                    -2^(n-1) to (2^(n-1))-1

            For unsigned data types, 

                    (2^n) – 1 

If we are minded the above formula we can easily find the range of datatype