小编Saj*_*S F的帖子

我正在尝试通过组合16位和8位值来填充64位无符号变量：

uint8_t byte0 = 0x00;
uint8_t byte1 = 0xAA;
uint8_t byte2 = 0x00;
uint8_t byte3 = 0xAA;

uint16_t hword0 = 0xAA00;
uint16_t hword1 = 0xAAAA;

uint64_t result = ( hword0 << 32 ) + ( byte3 << 24 ) + 
                  ( byte2 << 16 ) + ( byte1 << 8 ) + ( byte0 << 0  );

这给了我一个警告。

 left shift count >= width of type [-Wshift-count-overflow]
 uint64_t result = ( hword0 << 32 )

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