C Data Types

2022-01-06 488 words 3 minutes

C data types referance guide

Type	Explanation	Minimum size (bits)	Format specifier
`char`	Smallest addressable unit of the machine that can contain basic character set. It is an integer type. Actual type can be either signed or unsigned.	8	%c
`signed char`	Of the same size as char, but guaranteed to be signed. Capable of containing at least the [−127, +127] range.	8	%c (or %hhi for numerical output)
`unsigned char`	Of the same size as char, but guaranteed to be unsigned. Contains at least the [0, 255] range.	8	%c (or %hhu for numerical output)
`short` `short int` `signed short` `signed short int`	Short signed integer type. Capable of containing at least the [−32,767, +32,767] range.	16	%hi or %hd
`unsigned short` `unsigned short int`	Short unsigned integer type. Contains at least the [0, 65,535] range.	16	%hu
`int` `signed` `signed int`	Basic signed integer type. Capable of containing at least the [−32,767, +32,767] range.	16	%i or %d
`unsigned` `unsigned int`	Basic unsigned integer type. Contains at least the [0, 65,535] range.	16	%u
`long` `long int` `signed long` `signed long int`	Long signed integer type. Capable of containing 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. Capable of containing 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. Capable of containing at least the [−9,223,372,036,854,775,807, +9,223,372,036,854,775,807] range. Specified since the C99 version of the standard.	64	%lli or %lld
`unsigned long long` `unsigned long long int`	Long long unsigned integer type. Contains at least the [0, +18,446,744,073,709,551,615] range. Specified since the C99 version of the standard.	64	%llu
`float`	Real floating-point type, usually referred to as a single-precision floating-point type. Actual properties unspecified (except minimum limits); however, on most systems, this is the IEEE 754 single-precision binary floating-point format (32 bits). This format is required by the optional Annex F “IEC 60559 floating-point arithmetic”.		%f %F %g %G %e %E %a %A
`double`	Real floating-point type, usually referred to as a double-precision floating-point type. Actual properties unspecified (except minimum limits); however, on most systems, this is the IEEE 754 double-precision binary floating-point format (64 bits). This format is required by the optional Annex F “IEC 60559 floating-point arithmetic”.		%lf %lF %lg %lG %le %lE %la %lA ¹
`long double`	Real floating-point type, usually mapped to an extended precision floating-point number format. Actual properties unspecified. It can be either x86 extended-precision floating-point format (80 bits, but typically 96 bits or 128 bits in memory with padding bytes), the non-IEEE “double-double” (128 bits), IEEE 754 quadruple-precision floating-point format (128 bits), or the same as double. See the article on long double for details.		%Lf %LF %Lg %LG %Le %LE %La %LA ¹

Uppercase differs from lowercase in the output. Uppercase specifiers produce values in the uppercase, and lowercase in lower ↩︎ ↩︎