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std::numeric_limits::max_digits10

提供: cppreference.com

 
 
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static constexpr int max_digits10
(C + + 11以来)
std::numeric_limits<T>::max_digits10の値が一意にそのようなテキストにシリアライズ/デシリアライズのために必要に応じて型Tのすべての個別の値を表すために必要であるベース10桁の番号です。この定数は、すべての浮動小数点型データの意味があります.
Original:
The value of std::numeric_limits<T>::max_digits10 is the number of base-10 digits that are necessary to uniquely represent all distinct values of the type T, such as necessary for serialization/deserialization to text. This constant is meaningful for all floating-point types.
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[編集] 標準の専門分野

T
std::numeric_limits<T>::max_digits10の値
Original:
value of std::numeric_limits<T>::max_digits10
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/* non-specialized */ 0
bool 0
char 0
signed char 0
unsigned char 0
wchar_t 0
char16_t 0
char32_t 0
short 0
unsigned short 0
int 0
unsigned int 0
long 0
unsigned long 0
long long 0
unsigned long long 0
float std::floor(std::numeric_limits<float>::digits * std::log10(2) + 2)
double std::floor(std::numeric_limits<double>::digits * std::log10(2) + 2)
long double std::floor(std::numeric_limits<long double>::digits * std::log10(2) + 2)

[編集] ノート

背中最も数学的な操作、テキストに浮動小数点値の変換とは違っています'正確な限り、少なくともmax_digits10は(9floatため、17double用)を使用した:それが生成するために同じ浮動を保証されています中間のテキスト表現は正確ではない場合でも、ポイントは値。それは、10進表記でfloatの正確な値を表すために百桁以上かかることがあります.
Original:
Unlike most mathematical operations, the conversion of a floating-point value to text and back is exact as long as at least max_digits10 were used (9 for float, 17 for double): it is guaranteed to produce the same floating-point value, even though the intermediate text representation is not exact. It may take over a hundred decimal digits to represent the precise value of a float in decimal notation.
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[編集] も参照してください

[静的]
基数または指定されたタイプの表現で用いられる整数ベース
Original:
the radix or integer base used by the representation of the given type
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(公共の静的メンバ定数) [edit]
[静的]
変更せずに表現することができるradixの桁数を指定します
Original:
number of radix digits that can be represented without change
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(公共の静的メンバ定数) [edit]
[静的]
変更せずに表現できる小数点以下の桁数
Original:
number of decimal digits that can be represented without change
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(公共の静的メンバ定数) [edit]
有効な正規化された浮動小数点値である基数の最小の負のパワーよりも1
Original:
one more than the smallest negative power of the radix that is a valid normalized floating-point value
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(公共の静的メンバ定数) [edit]
有効な有限浮動小数点値である基数の最大の整数乗よりも1
Original:
one more than the largest integer power of the radix that is a valid finite floating-point value
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(公共の静的メンバ定数) [edit]