1) 无符号数据类型(UNSIGNED TYPE) 无符号数据类型代表一个无符号的数值,在综合器中,这个数值被解释为一个二进制 数,这个二进制数的最左位是其最高位.
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Otherwise, the common type is the unsigned type corresponding to the signed type.
否则，公共类型是对应该有符号类型的无符号类型。
Otherwise, if the signed integer type can represent all of the values of the unsigned type, the common type is the signed type.
否则，如果有符号整型可以表示无符号整型的值时，公共类型是有符号类型。
If the unsigned integer type has rank greater than or equal to the rank of the signed integer type, the common type is the unsigned type.
如果无符号整型的优先级高于或等于有符号类型，公共类型是无符号类型。
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