關於int8_t,uint8_t.....等數據類型的理解

實習中，今天在看公司源碼的時候，發現前輩給的代碼都是這樣的

typedef int8_t int8;
typedef uint8_t uint8;
typedef int16_t int16;
typedef uint16_t uint16;
typedef word_t word16;
typedef int32_t int32;
typedef uint32_t uint32;
typedef dword_t dword32;
typedef int64_t int64;
typedef uint64_t uint64;
typedef uint32 color_t;

typedef time_t time64;
typedef wchar_t char16;//寬字符
typedef char    char8;

　身為小白的我內心是這樣的      ？？？？？？？

查找后得出了結論，其實這些都是已經被typedef過的類型：

typedef signed char int8_t;
typedef unsigned char uint8_t;

typedef int int16_t;
typedef unsigned int uint16_t;

typedef long int32_t;
typedef unsigned long uint32_t;

typedef long long int64_t;
typedef unsigned long long uint64_t;   

　　這些包含在inttypes.h頭文件，據說這樣做的原因是方便移植，比如int8就是8位大小占一字節，int32，，32位大小4字節… 
這樣相對應的占位符也就清楚了：

char /unsigned char: %c
int : %d 
unsigned int: %u  
long: %ld; 
unsigned long:%lu
long long: %lld(%l64d)
unsigned long long:%Ilu(%l64u)

　即：

int8_t:%c;
uint8_t:%c;

int16_t: %d;
uint16_t:%u;

int32_t:%ld;
uint32_t:%lu;

int64_t：%lld(%l64d);
uint64_t:%llu(%l64u);

資料：https://blog.csdn.net/eusia/article/details/76401235