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IEEE 754 双精度计算公式中的M为什么要加1

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IEEE 754 双精度计算公式中的M为什么要加1

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S：符号位 0或者1 1个bit位表示
E：为了表示整数或者小数便宜了1023位，由11个bit位表示
M：52个bit位表示

为什么公式定义时M+1？M不行么？


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