#include <iomanip>代表什么头文件的？

ctype是一系列和类型有关的头文件，比如isdigit() isxdigit isupper() 等等
iomanip.h是常见与iostream配合使用的，比如控制流输出的函数：setw，left，right等等，如果使用要
using namespace std;

Standard C++ Library Reference
setw
See Also Example
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Specifies the width of the display field.

T6 setw(
streamsize _Wide
);

Parameters
_Wide
The width of the display field.

Return Value
The manipulator returns an object that, when extracted from or inserted into the stream str, calls str.width(_Wide), then returns str.

Example
Copy Code
// iomanip_setw.cpp
// compile with: /EHsc
// Defines the entry point for t