簡單來說，uint8_t / uint16_t / uint32_t /uint64_t這些數據類型都只是別名而來，具體如下：
一、C語言數據基本類型
在C語言中有6種基本數據類型：short、int、long、float、double、char
1）整型：short int、int、long int
2）浮點型：float、double
3）字符類型：char
二、分析uint8_t\uint_16_t\uint32_t\uint64_t
1、數據來源：這些數據類型中都帶有_t, _t 表示這些數據類型是通過typedef定義的，而不是新的數據類型。也就是說，它們其實是我們已知的類型的別名。
2、typedef：typedef用來定義關鍵字或標識符的別名
3、使用原因：方便代碼的維護。比如，在C中沒有bool型，於是在一個軟件中，一個程序員使用int，一個程序員使用short，會比較混亂，最好用一個typedef來定義一個統一的bool，每個程序員都可以用這個別名的bool。
不同的平台會有不同的字長，所以利用預編譯和typedef可以方便的維護代碼。
typedef unsigned char uint8_t;//將uint8_t別名為無符號字符型
4、定義：在C99標准中定義了這些數據類型，具體定義在：stdint.h中
定義類型如下：
typedef signed char int8_t;
typedef signed short int int16_t;
typedef signed int int32_t;
typedef signed __INT64 int64_t;
/* exact-width unsigned integer types */
typedef unsigned char uint8_t;
typedef unsigned short int uint16_t;
typedef unsigned int uint32_t;
typedef unsigned __INT64 uint64_t;
/* 7.18.1.2 */
/* smallest type of at least n bits */
/* minimum-width signed integer types */
typedef signed char int_least8_t;
typedef signed short int int_least16_t;
typedef signed int int_least32_t;
typedef signed __INT64 int_least64_t;
/* minimum-width unsigned integer types */
typedef unsigned char uint_least8_t;
typedef unsigned short int uint_least16_t;
typedef unsigned int uint_least32_t;
typedef unsigned __INT64 uint_least64_t;
/* 7.18.1.3 */
/* fastest minimum-width signed integer types */
typedef signed int int_fast8_t;
typedef signed int int_fast16_t;
typedef signed int int_fast32_t;
typedef signed __INT64 int_fast64_t;
/* fastest minimum-width unsigned integer types */
typedef unsigned int uint_fast8_t;
typedef unsigned int uint_fast16_t;
typedef unsigned int uint_fast32_t;
typedef unsigned __INT64 uint_fast64_t;
/* 7.18.1.4 integer types capable of holding object pointers */
#if __sizeof_ptr == 8
typedef signed __INT64 intptr_t;
typedef unsigned __INT64 uintptr_t;
#else
typedef signed int intptr_t;
typedef unsigned int uintptr_t;
#endif
/* 7.18.1.5 greatest-width integer types */
typedef signed __LONGLONG intmax_t;
typedef unsigned __LONGLONG uintmax_t;
5、格式化輸出：
1）uint16_t %hu
2）uint32_t %u
3）uint64_t %llu
6、uint8_t類型的輸出：
typedef unsigned char uint8_t;//將uint8_t別名為無符號字符型
uint8_t buf = 65;
printf("buf = %d",buf);//錯誤
printf("buf = %c",buf);//正確，打印出字符的ASCII碼
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原文鏈接：https://blog.csdn.net/weixin_42108484/article/details/82692087