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std::showpoint

STD：：展示点，STD：：nohowpoint

Defined in header ​​
std::ios_base& showpoint( std::ios_base& str (1)​
std::ios_base& noshowpoint( std::ios_base& str (2)​

启用或禁用在浮点输出中无条件地包含小数点字符.。对输入没有影响。

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

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

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

要用作小数点字符的字符由输出时注入到流中的区域设置的num点面确定，如std::num_put::put...

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 << "1.0 with showpoint: " << std::showpoint << 1.0 << '\n'
              << "1.0 with noshowpoint: " << std::noshowpoint << 1.0 << '\n';
}

二次

产出：

二次

1.0 with showpoint: 1.00000
1.0 with noshowpoint: 1

二次

另见

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

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