名前空間
変種
操作

std::strtof, std::strtod, std::strtold

提供: cppreference.com
< cpp‎ | string‎ | byte

 
 
ストリングスライブラリ
NULLで終わる文字列
Original:
Null-terminated strings
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バイト文字列
文字列をマルチバイト
ワイド文字列
クラス
Original:
Classes
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basic_string
char_traits
 
NULL終端バイト文字列
機能します
Original:
Functions
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文字操作
Original:
Character manipulation
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数値形式への変換
Original:
Conversions to numeric formats
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strtoul
strtoull
strtof
strtod
strtold
文字列操作
Original:
String manipulation
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strcpy
strncpy
strcat
strncat
strxfrm
文字列の検査
Original:
String examination
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メモリ操作
Original:
Memory manipulation
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memchr
memcmp
memset
memcpy
memmove
その他
Original:
Miscellaneous
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strerror
 
Defined in header <cstdlib>
float       strtof( const char* str, char** str_end );
(C++11およびそれ以降)
double      strtod( const char* str, char** str_end );
long double strtold( const char* str, char** str_end );
(C++11およびそれ以降)
strが指すバイト列の浮動小数点値を解釈.
Original:
Interprets a floating point value in a byte string pointed to by str.
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最初の非空白文字が検出されるまで、この関数は(std::isspace()によって決定されるように)任意の空白文字を破棄します。それは有効な浮動小数点表現を形成するために、できるだけ多くの文字を取り、浮動小数点値に変換します。有効な浮動小数点値は、次のいずれかを指定できます
Original:
Function discards any whitespace characters (as determined by std::isspace()) until first non-whitespace character is found. Then it takes as many characters as possible to form a valid floating point representation and converts them to floating point value. The valid floating point value can be one of the following:
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  • 進浮動小数点式。それは次の部分から構成されます
    Original:
    decimal floating point expression. It consists of the following parts:
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  • (オプション)プラス記号またはマイナス記号
    Original:
    (オプション) plus or minus sign
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  • オプションで小数点文字(定義仮)を含む小数桁数の空ではないシーケンス
    Original:
    nonempty sequence of decimal digits optionally containing a decimal point character (defines significand)
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  • (オプション)eまたはEマイナスオプションまたはプラス記号と小数点以下桁数の空でないシーケンス(定義指数)と続いた
    Original:
    (オプション) e or E followed with optional minus or plus sign and nonempty sequence of decimal digits (defines exponent)
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  • 進浮動小数点式。それは次の部分から構成されます
    Original:
    binary floating point expression. It consists of the following parts:
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  • (オプション)プラス記号またはマイナス記号
    Original:
    (オプション) plus or minus sign
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  • 0x or 0X
  • オプションで小数点文字(定義仮)を含む進数字の空ではないシーケンス
    Original:
    nonempty sequence of hexadecimal digits optionally containing a decimal point character (defines significand)
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  • (オプション)pまたはPマイナスオプションまたはプラス記号と16進数の空でないシーケンス(定義指数)と続いた
    Original:
    (オプション) p or P followed with optional minus or plus sign and nonempty sequence of hexadecimal digits (defines exponent)
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  • 無限式。それは次の部分から構成されます
    Original:
    infinity expression. It consists of the following parts:
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  • (オプション)プラス記号またはマイナス記号
    Original:
    (オプション) plus or minus sign
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  • INFまたはINFINITY大文字小文字の区別を無視して
    Original:
    INF or INFINITY ignoring case
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  • 非数値式。それは次の部分から構成されます
    Original:
    not-a-number expression. It consists of the following parts:
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  • (オプション)プラス記号またはマイナス記号
    Original:
    (オプション) plus or minus sign
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  • NANまたはNAN(' char_sequence)NAN部分の大文字小文字の区別を無視。 ' char_sequence英数字のみを含めることができます。結果はクワイエットNaN浮動小数点値です.
    Original:
    NAN or NAN(char_sequence) ignoring case of the NAN part. char_sequence can only contain alphanumeric characters. The result is a quiet NaN floating point value.
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関数は、最後の文字の解釈の文字を指すようにstr_endが指すポインタを設定します。 str_endNULLである場合、それは無視されます.
Original:
The functions sets the pointer pointed to by str_end to point to the character past the last character interpreted. If str_end is NULL, it is ignored.
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目次

[編集] パラメータ

str -
解釈されるNULL終端バイト文字列へのポインタ
Original:
pointer to the null-terminated byte string to be interpreted
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str_end -
文字へのポインタへのポインタ..
Original:
pointer to a pointer to character.
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[編集] 値を返します

成功した場合にstrの内容に応じたポイント値に浮かぶ。変換された値が対応する戻り値の型の範囲から外れた場合、範囲エラーが発生し、HUGE_VALHUGE_VALFまたはHUGE_VALL返されます。変換を実行できなかった場合は、0が返されます。.
Original:
Floating point value corresponding to the contents of str on success. If the converted value falls out of range of corresponding return type, range error occurs and HUGE_VAL, HUGE_VALF or HUGE_VALL is returned. If no conversion can be performed, 0 is returned.
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[編集]

[編集] も参照してください

浮動小数点値をバイト文字列に変換します
Original:
converts a byte string to a floating point value
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(関数) [edit]
C documentation for strtof, strtod, strtold