Hexadecimal constants without a suffix are defined as an unsigned int if it will fit into 32-bits and if the high order bit is turned on.
如果一个没有后缀的16进制的常量是32位的，并且其高位被置位了，那么它就可以作为无符号整型进行定义。
Hexadecimal constants without a suffix are defined as an unsigned int if it will fit into 32-bits and if the high order bit is turned on.
如果一个没有后缀的16进制的常量是32位的，并且其高位被置位了，那么它就可以作为无符号整型进行定义。
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