如何让我的打印像桌子一样？

Question

我打印出以下代码：

cout<<current->bookId<<"\t\t"<<current->bookName<<"\t\t"<<current->year<<"\t\t";
cout<<"Checked out by student "<<current->storedBy<<endl;

看起来像这样

BookId          BookName                Year            Status
1000            Machine Learning                1997            Checked out by student 21000000
1200            Data Mining             1991            Checked out by student 21000020
1400            C++ How to Program              2005            Checked out by student 21000020
1500            Pattern Recognition             2000            Checked out by student 21000000

我该怎么做才能做到这一点：

BookId          BookName                        Year            Status
1000            Machine Learning                1997            Checked out by student 21000000
1200            Data Mining                     1991            Checked out by student 21000020
1400            C++ How to Program              2005            Checked out by student 21000020
1500            Pattern Recognition             2000            Checked out by student 21000000

Answer 1

Set field width std::setw正是您要找的。

用法示例：

#include <iostream>     // std::cout, std::endl
#include <iomanip>      // std::setw

int main () {
  std::cout << std::setw(10) << "test" << std::endl; 
  return 0;
}

由于参数为10，因此std::setw将在屏幕的第10,11,12,13个字符上显示"test"。

在您的情况下，您将使用与此类似的例程，并且通过一些试验和错误，您将实现您想要的目标：

std::cout << std::setw(10) << "col1" << std::setw(5) << "col2" << std::endl;