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std::showpos

STD：展示，STD：：nohowpos

Defined in header ​​
std::ios_base& showpos( std::ios_base& str (1)​
std::ios_base& noshowpos( std::ios_base& str (2)​

启用或禁用加号的显示。'+'在非负整数输出中。对输入没有影响。

1%29启用showpos溪流中的旗子str好像通过打电话str.setf(std::ios_base::showpos)...

2%29禁用showpos溪流中的旗子str好像通过打电话str.unsetf(std::ios_base::showpos)...

这是一个I/O操作程序，可以用表达式调用它，如out << std::showpos对任何out类型std::basic_ostream或使用表达式，如in >> std::showpos对任何in类型std::basic_istream...

参数

str-reference to I/O stream

返回值

str%28操作后对流的引用%29。

例

二次

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

二次

产出：

二次

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

二次

另见

resetiosflagsclears the specified ios_base flags (function)
setiosflagssets the specified ios_base flags (function)

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