cout格式化 [英] cout Formatting

问题描述

我确定这是一个关于格式化的简单问题，但这里是我想要完成的：

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输出数据到屏幕上。我想以表格格式输出。我的意思是，列和行应该正确对齐。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

我只关心个别行，所以我现在输出的行（不工作）是

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

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

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

这给了我一些东西：

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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