我怎样才能像一张桌子一样打印出来？

Question

我有以下代码要打印：

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

设置字段宽度 std::setw是您正在寻找的。

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，所以std::setw会显示"test"在屏幕的第10、11、12、13个字符上。

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：

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