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浮動小数点数のビット数と有効桁数

Last updated at Posted at 2017-09-05

はじめに

浮動小数点数のビット数と有効桁数の一覧を記載します。

対応表

10進数有効桁数とCの対応表を次に示します。

type bit length (A) (B)
float 32 24 7.22
double 64 53 15.95
long double 80 64 19.26

(A) : 有効桁のビット長
(B) : 10進数有効桁数 = $log_{10} 2^{(A)}$

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