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定点数的动态范围比具有相同字长的浮点数小得多。使用定点数据类型时,必须仔细考虑量化对精度、范围和定标的影响。定点数据类型具有以下特征:以位为单位的字长、二进制小数点的位置,以及是有符号还是无符号。二进制小数点的位置用来定标和解释定点值。
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