Traditional C language integer type

A list of traditional C language integer types. The list is translated and quoted from C data types on Wikipedia.

Same size as

type	Explanation	Minimum size (bits)	Format specifier
char	The minimum addressable unit of a machine that can contain the basic character set. It is an integer type. The actual type is either signed or unsigned.	8	%c
signed char	char , but guaranteed to be signed. It can include at least the range [−127, +127].	8	%c (%hhi for numeric output `)`
unsigned char	char , but guaranteed to be unsigned. Includes at least a range of [0, 255].	8	%c (or `%hhu for numeric output)`
short short int signed short signed short int	Short Signed integer type. It can include at least the range [-32,767, +32,767].	16	%hi or %hd
unsigned short unsigned short int	Short Unsigned integer type. Includes at least a range of [0, 65, 535].	16	%hu
int signed signed int	Basic signed integer type. It can include at least the range [-32,767, +32,767].	16	%i or %d
unsigned unsigned int	Basic unsigned integer type. Includes at least a range of [0, 65, 535].	16	%u
long long int signed long signed long int	Long Signed integer type. It can include at least the [-2,147,483,647, +2,147,483,647] range.	32	%li or %ld
unsigned long unsigned long int	Long Unsigned integer type. It can contain at least the [0,4,294,967,295] range.	32	%lu
long long long long int signed long long signed long long int	Long Long Signed integer type. It can include at least the [-9,223,372,036,854,775,807, +9,223,372,036,854,775,807] range. C99 Specified after the standard version.	64	%lli or %lld
unsigned long long unsigned long long int	Long long sign None Integer type. It includes at least the [0, +18,446,744,073,709,551,615] range. C99 Standard specification after version.	64	%llu

Notes on traditional C integer types

Here are some caveats about traditional C integer types.

Char with and without sign depends on the processing system

Signed / unsigned char depends on the processing system. By setting "signed char" and "unsigned char", it is possible to confirm whether the sign is signed or unsigned.

This is confusing, so char is used to represent characters, and uint8_t when expressing html "> int8_t and unsigned 8-bit integer type.

int is not a signed 32-bit integer

Note that the C specification defines only the minimum width for traditional integer types. The minimum width of int is 16bit. It is implemented as a 32-bit integer type in many processing systems, but please note that it is not a 32-bit signed integer type as a C language specification.

When dealing with integer types, it is recommended to use the width-guaranteed integer types introduced in C99.

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