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目录数据类型隐含的强制类型转换类型转换规则：自动类型转换数据类型数据类型所占字节数最小值最大值默认值byte1个字节(8位)-1281270short2个字节(16位)-32768327670int4个字节(32位)-2,147,483,648（-2^31）2,147,483,647（2^31 - ...

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