名前空間
変種
操作

std::fixed, std::scientific, std::hexfloat, std::defaultfloat

提供: cppreference.com
< cpp‎ | io‎ | manip

 
 
入力/出力ライブラリ
I / Oのマニピュレータ
CスタイルのI / O
バッファ
Original:
Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf(廃止予定)
ストリーム
Original:
Streams
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抽象化
Original:
Abstractions
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ios_base
basic_ios
basic_istream
basic_ostream
basic_iostream
ファイルI / O
Original:
File I/O
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basic_ifstream
basic_ofstream
basic_fstream
文字列I / O
Original:
String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
アレイのI / O
Original:
Array I/O
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istrstream(廃止予定)
ostrstream(廃止予定)
strstream(廃止予定)
タイプ
Original:
Types
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streamoff
streamsize
fpos
エラーカテゴリインターフェース
Original:
Error category interface
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iostream_category(C++11)
io_errc(C++11)
 
入力/出力マニピュレータ
浮動小数点の書式
Original:
Floating-point formatting
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fixed
scientific
hexfloat
defaultfloat


(C++11)
(C++11)
整数フォーマット
Original:
Integer formatting
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ブールの書式
Original:
Boolean formatting
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boolalpha
noboolalpha
フィールド幅と塗りつぶしコントロール
Original:
Field width and fill control
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その他の書式
Original:
Other formatting
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空白処理
Original:
Whitespace processing
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出力がフラッシュします
Original:
Output flushing
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ステータスフラグ操作
Original:
Status flags manipulation
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時間とお金のI / O
Original:
Time and money I/O
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get_money(C++11)
get_time(C++11)
put_money(C++11)
put_time(C++11)
 
Defined in header <ios>
(1)
std::ios_base& scientific( std::ios_base& str );
(2)
std::ios_base& hexfloat( std::ios_base& str );
(3) (C++11およびそれ以降)
std::ios_base& defaultfloat( std::ios_base& str );
(4) (C++11およびそれ以降)
浮動小数点のI / O用の既定の書式を変更します
Original:
Modifies the default formatting for floating-point I/O
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1)
ストリームのfloatfieldを設定strfixedかのようにstr.setf(std::ios_base::fixed, std::ios_base::floatfield)を呼び出すことによって
Original:
sets the floatfield of the stream str to fixed as if by calling str.setf(std::ios_base::fixed, std::ios_base::floatfield)
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2)
ストリームのfloatfieldを設定strscientificかのようにstr.setf(std::ios_base::scientific, std::ios_base::floatfield)を呼び出すことによって
Original:
sets the floatfield of the stream str to scientific as if by calling str.setf(std::ios_base::scientific, std::ios_base::floatfield)
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3)
ストリームのbasefieldを設定strfixedscientific同時にstr.setf(std::ios_base::fixed | std::ios_base::scientific, std::ios_base::floatfield)を呼び出したかのように。これは、16進数浮動小数点フォーマットを可能に.
Original:
sets the basefield of the stream str to fixed and scientific simultaneously as if by calling str.setf(std::ios_base::fixed | std::ios_base::scientific, std::ios_base::floatfield). This enables hexadecimal floating-point formatting.
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4)
basefieldを呼び出したかのように、ゼロにストリームstrstr.unsetf(std::ios_base::floatfield)を設定します。これは、固定および科学とは異なるデフォルトの浮動小数点フォーマットを可能に.
Original:
sets the basefield of the stream str to zero, as if by calling str.unsetf(std::ios_base::floatfield). This enables the default floating-point formatting, which is different from fixed and scientific.
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これは、I / Oのマニピュレータである、そのようなタイプのout << std::fixedのいずれout、またはそのようなタイプの任意のstd::basic_ostreamin >> std::scientificためinとして式を持つstd::basic_istreamとして式と呼ばれるかもしれない.
Original:
This is an I/O manipulator, it may be called with an expression such as out << std::fixed for any out of type std::basic_ostream or with an expression such as in >> std::scientific for any in of type std::basic_istream.
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目次

[編集] パラメータ

str -
I / Oストリームを参照します
Original:
reference to I/O stream
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[編集] 値を返します

str(操作後のストリームへの参照)
Original:
str (reference to the stream after manipulation)
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[編集]

#include <iostream>
#include <sstream>
int main()
{
    std::cout << "The number 0.01 in fixed:      " << std::fixed << 0.01 << '\n'
              << "The number 0.01 in scientific: " << std::scientific << 0.01 << '\n'
              << "The number 0.01 in hexfloat:   " << std::hexfloat << 0.01 << '\n'
              << "The number 0.01 in default:    " << std::defaultfloat << 0.01 << '\n';
    double f;
    std::istringstream("0x1P-1022") >> std::hexfloat >> f;
    std::cout << "Parsing 0x1P-1022 as hex gives " << f << '\n';
}

Output:

The number 0.01 in fixed:      0.010000
The number 0.01 in scientific: 1.000000e-02
The number 0.01 in hexfloat:   0x1.47ae147ae147bp-7
The number 0.01 in default:    0.01
Parsing 0x1P-1022 as hex gives 2.22507e-308

[編集] も参照してください

浮動小数点の精度を変更します
Original:
changes floating-point precision
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(関数) [edit]