Uint8 Uint16 Uint32 Sint8 Sint16 Sint32 in SDL

typedef int8_t Sint8;
typedef uint8_t Uint8;
typedef int16_t Sint16;
typedef uint16_t Uint16;
typedef int32_t Sint32;
typedef uint32_t Uint32;

#ifdef SDL_HAS_64BIT_TYPE
typedef int64_t Sint64;
#ifndef SYMBIAN32_GCCE
typedef uint64_t Uint64;

Unsigned:表示無號，沒有負號，所以其範圍為正值
Singed:表示有號，有負號(一般沒有特別指名為 Unsigned皆為Singed)

uint8	0 to 255	Unsigned 8-bit integer
uint16	0 to 65,535	Unsigned 16-bit integer
uint32	0 to 4,294,967,295	Unsigned 32-bit integer
uint64	0 to 18,446,744,073,709,551,615	Unsigned 64-bit integer