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std::ios_base::width

科技促进发展：监督办[医]底座：：宽度

streamsize width() const;(1)​
streamsize width( streamsize new_width (2)​

管理要在特定输出操作上生成的最小字符数和要在特定输出操作中生成的最大字符数。

1%29返回当前字段宽度。

2%29将字段宽度设置为给定的字段宽度。

参数

new_width-new field width setting

返回值

调用函数之前的字段宽度。

注记

一些I/O函数调用width(0)返回前，请参阅std::setw%28这导致此字段只对下一个I/O函数产生影响，而不影响任何后续的I/O%29。

该修饰符对输入和输出的确切影响在各个I/O函数之间有所不同，并在每个函数中描述。operator<<和operator>>单独过载页面。

例

另见

precisionmanages decimal precision of floating point operations (public member function)

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