Introduction to Programming - (C Language) - Unit : 1 – DATA TYPES

 

DATATYPES IN C

·     Each variable in C has an associated data type. It specifies the type of data that the variable can store like integer, character, floating, double, etc.

·     Each data type requires different amounts of memory and has some specific operations which can be performed over it.

·     Please keep in mind that storage size and range for int and float datatype will vary depend on the CPU processor (8,16, 32 and 64 bit)

·      Below table gives the detail about the storage size,format specifier and range of each C basic data types.

DATATYPE	SIZE (BYTES)	FORMAT SPECIFIER	RANGE
int	atleast 2, usually 4	%d,%i	-32,768 to 32,767
char	1	%c	-128 to 127  or 0 to 255
float	4	%f	1E-37 to 1E+37 with 6 digits of precision
double	8	%lf	1E-37 to 1E+37 with 10 digits of precision
short int	Usually 2	%hd	-32,767 to 32,767
unsigned int	atleast 2, usually 4	%u	0 to 65,535 or 0 to 4,294,967,295(0 to 65,535)
long int	atleast 4,  usually 8	%ld,%li	-2,147,483,647 to 2,147,483,647
long long int	atleast 8	%lld,%lli	-(263-1) to (263-1)
unsigned long int	atleast 4	%lu	0 to 4,294,967,295
unsigned long long int	atleast 8	%llu	264-1(Added by C99)
signed char	1	%c	-128 to 127
unsigned char	1	%c	0 to 255
long double	atleast 10, usually 12 or 16	%lf	1E-37 to 1E+37 with 10 digits of precision
signed int	16 or 32		Same as int
unsigned short int	16		0 to 65,535
signed short int	16		Same as short int
signed long int	32		Same as long int