Data Types

Basic data types

Data Type	Size	Range	Description
char	1 byte	−128 ~ 127	single character/alphanumeric/ASCII
signed char	1 byte	−128 ~ 127
unsigned char	1 byte	0 ~ 255
int	2 to 4 bytes	−32,768 ~ 32,767	store integers
signed int	2 bytes	−32,768 ~ 32,767
unsigned int	2 bytes	0 ~ 65,535
short int	2 bytes	−32,768 ~ 32,767
signed short int	2 bytes	−32,768 ~ 32,767
unsigned short int	2 bytes	0 ~ 65,535
long int	4 bytes	-2,147,483,648 ~ 2,147,483,647
signed long int	4 bytes	-2,147,483,648 ~ 2,147,483,647
unsigned long int	4 bytes	0 ~ 4,294,967,295
float	4 bytes	3.4E-38 ~ 3.4E+38
double	8 bytes	1.7E-308 ~ 1.7E+308
long double	10 bytes	3.4E-4932 ~ 1.1E+4932

Data types

// create variables
int myNum = 5; // integer
float myFloatNum = 5.99; // floating point number
char myLetter = 'D'; // string
// High precision floating point data or numbers
double myDouble = 3.2325467;
// print output variables
printf("%d\n", myNum);
printf("%f\n", myFloatNum);
printf("%c\n", myLetter);
printf("%lf\n", myDouble);

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Data Type	Description
char	character type
short	short integer
int	integer type
long	long integer
float	single-precision floating-point type
double	double-precision floating-point type
void	no type

Basic format specifiers

Format Specifier	Data Type
%d or %i	int integer
%f	float single-precision decimal type
%lf	double high precision floating point data or number
%c	char character
%s	for strings strings

Separate base format specifiers

Format	Short	Int	Long
Octal	%ho	%o	%lo
Decimal	%hd	%d	%ld
Hexadecimal	%hx / %hX	%x / %X	%lx / %lX

Data format example

int myNum = 5;
float myFloatNum = 5.99; // floating point number
char myLetter = 'D';     // string
// print output variables
printf("%d\n", myNum);
printf("%f\n", myFloatNum);
printf("%c\n", myLetter);

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