c data type

資料型態

關鍵字	位長	範圍	printf chars
char	1	-128..127 (或0..255，與體系結構相關)	%c
unsigned char	1	0..255
signed char	1	-128..127
int	2 (Dos或win16) or 4 (win32或unix)	-32768..32767  or -2147483648..2147483647	%i, %d
unsigned int	2 (Dos或win16)  or 4 (win32或unix)	0..65535 or 0..4294967295	%u
signed int	2 (Dos或win16)  or 4 (win32或unix)	-32768..32767 or -2147483648..2147483647	%i, %d
short int	2	-32768..32767	%hi
unsigned short	2	0..65535	%hu
signed short	2	-32768..32767
long int	4	-2147483648..2147483647	%li, %ld
unsigned long	4	0..4294967295	%lu
signed long	4	-2147483648..2147483647
long long	8	-9223372036854775808..9223372036854775807	%lli
unsigned long long	8	0..18446744073709551615	%llu
float	4	3.4x10-38..3.4x10+38 (7 sf)	%f, %e, %g
double	8	1.7x10-308..1.7x10+308 (15 sf)	%f, %e, %g
long double	8 或以上	編譯器相關	%Lf, %Le, %Lg

https://msdn.microsoft.com/zh-tw/library/s3f49ktz.aspx