std::showpos, std::noshowpos

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< cpp | io | manip

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C++
 
输入/输出库
I / O操纵
C-风格的I / O
缓冲区
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Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf（过时了）
流
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Streams
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抽象
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Abstractions
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ios_base
basic_ios
basic_istream
basic_ostream
basic_iostream
文件I / O
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File I/O
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basic_ifstream
basic_ofstream
basic_fstream
字符串I / O
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String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
阵列的I / O
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Array I/O
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istrstream（过时了）
ostrstream（过时了）
strstream（过时了）
类型
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Types
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streamoff
streamsize
fpos
Error类的接口
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Error category interface
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iostream_category（C++11）
io_errc（C++11）
 
输入/输出操纵
浮点格式
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Floating-point formatting
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fixed
scientific
hexfloat
defaultfloat

（C++11）
（C++11）
整型格式
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Integer formatting
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布尔格式
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Boolean formatting
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boolalpha
noboolalpha
场的宽度和填充控制
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Field width and fill control
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其他格式
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Other formatting
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showpos
noshowpos
空白处理
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Whitespace processing
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输出冲洗
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Output flushing
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状态标志位操作
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Status flags manipulation
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时间和金钱I / O
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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>
std::ios_base& showpos( std::ios_base& str );
 (1)
std::ios_base& noshowpos( std::ios_base& str );
 (2)
启用或禁用的非负整数，输出中的加号'+'显示。有没有对输入的影响.
Original:
Enables or disables the display of the plus sign '+' in non-negative integer output. Has no effect on input.
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1)
流中的showpos如果通过调用str使str.setf(std::ios_base::showpos)标志
Original:
enables the showpos flag in the stream str as if by calling str.setf(std::ios_base::showpos)
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2)
如果通过调用showpos禁用流中的strstr.unsetf(std::ios_base::showpos)标志
Original:
disables the showpos flag in the stream str as if by calling str.unsetf(std::ios_base::showpos)
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这是一个I / O操纵器，它可被称为与表达式如out << std::showpos类型out任何std::basic_ostream，或与一个表达式如in >> std::showpos类型in任何std::basic_istream.
Original:
This is an I/O manipulator, it may be called with an expression such as out << std::showpos for any out of type std::basic_ostream or with an expression such as in >> std::showpos for any in of type std::basic_istream.
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目录

[编辑] 参数

str -
参考I / O流
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reference to I/O stream
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[编辑] 返回值

str（参考操作后到流）
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str (reference to the stream after manipulation)
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[编辑] 为例

#include <iostream>
int main()
{
        std::cout << "showpos: " << std::showpos << 42 << ' ' << 3.14 << ' ' << 0 << '\n'
                  << "noshowpos: " << std::noshowpos << 42 << ' ' << 3.14 << ' ' << 0 << '\n';
}

Output: 

showpos: +42 +3.14 +0
noshowpos: 42 3.14 0

[编辑] 另请参阅
清除指定的ios_bas​​e标志
Original:
clears the specified ios_base flags
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（函数） [edit]
设置指定的ios_bas​​e标志
Original:
sets the specified ios_base flags
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（函数） [edit]
来自“http://zh.cppreference.com/mwiki/index.php?title=cpp/io/manip/showpos&oldid=27273”