Exponent bias

The floating point format of the IBM 704 introduced the use of a biased exponent in 1954.

In IEEE 754 floating point numbers, the exponent is biased in the engineering sense of the word – the value stored is offset from the actual value by the exponent bias. Biasing is done because exponents have to be signed values in order to be able to represent both tiny and huge values, but two's complement, the usual representation for signed values, would make comparison harder.

单词	Biased exponent
释义	Biased exponent 英语百科 Exponent bias The floating point format of the IBM 704 introduced the use of a biased exponent in 1954. In IEEE 754 floating point numbers, the exponent is biased in the engineering sense of the word – the value stored is offset from the actual value by the exponent bias. Biasing is done because exponents have to be signed values in order to be able to represent both tiny and huge values, but two's complement, the usual representation for signed values, would make comparison harder.
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Biased exponent

Exponent bias