将cout格式与表格的列对齐 [英] Align cout format as table's columns

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问题描述

我很确定这是一个关于格式化的简单问题,但这是我要完成的工作:

I'm pretty sure this is a simple question in regards to formatting but here's what I want to accomplish:

我想使用cout将数据输出到屏幕上.我想以表格格式的形式输出.我的意思是列和行应正确对齐.示例:

I want to output data onto the screen using cout. I want to output this in the form of a table format. What I mean by this is the columns and rows should be properly aligned. Example:

Test                 1
Test2                2
Iamlongverylongblah  2
Etc                  1

我只关心单个行,所以现在要输出的行(不起作用)是

I am only concerned with the individual line so my line to output now (not working) is

cout << var1 << "\t\t" << var2 << endl;

哪个给了我类似的东西

Test                 1
Test2                  2
Iamlongverylongblah         2
Etc                  1

推荐答案

setw

#include <iostream>
#include <iomanip>
using namespace std;

int main () {
  cout << setw(21) << left << "Test"    << 1 << endl;
  cout << setw(21) << left << "Test2"   << 2 << endl;
  cout << setw(21) << left << "Iamlongverylongblah"     << 2 << endl;
  cout << setw(21) << left << "Etc"     << 1 << endl;
  return 0;
}

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