u8代表无符号字符型,即unsigned char;
u16代表无符号短整型,即unsigned short int;
u32代表无符号整型,即unsigned int
int8_t代表有符号字符型,即signed char;
int16_t代表有符号短整型,即signed short int;
int32_t代表有符号整型,即signed int。
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