如何与String Arduino一起打印Integer? [英] How to print Integer alongside String Arduino?

问题描述

我正在尝试在字符串旁边打印一个整数，但是它实际上并不能解决问题，并且变得令人困惑.

I am trying to print an integer alongside a string but it's not really working out and am getting confused.

int cmdSeries = 3;

Serial.println("Series : " + cmdSeries);// That's where the problem occur

在Visual Basic中，我们通常采用这种方式:

In visual basic we used to do it this way:

Dim cmdSeries As Integer
Console.Writeline(""Series : {0}", cmdSeries)

所以我已经用Serial.println尝试过，但是它返回此错误: 重载的'println(const char [14]，int&)'的调用是不明确的

So i've tried it with Serial.println but it returns this error : call of overloaded 'println(const char [14], int&)' is ambiguous

任何人都可以帮忙吗，我想在不使用任何库的情况下以干净的方式实现这一目标.

Can anyone help my out, I want to achieve this without using any libraries and in a clean way.

推荐答案

Arduino字符串类和常规C字符串之间存在巨大差异. 第一个重载加法运算符，但是动态内存几乎过多使用.主要是如果您使用类似的东西:

There is a huge difference between Arduino String class and regular C-string. The first one overloads addition operator, but there is almost excessive usage of dynamic memory. Mainly if you use something like:

String sth = String("blabla") + intVar + "something else" + floatVar;

使用以下方法会更好:

Serial.print("Series : ");
Serial.println(cmdSeries);

顺便说一句，此字符串文字位于Flash和RAM内存中，因此，如果您只想强制使用Flash:

Btw, this string literal resides in Flash and RAM memory, so if you want to force using flash only:

Serial.print(F("Series : "));

但这仅适用于基于AVR的Arduino.如果您使用大量文字，则此宏可以节省大量RAM.

But it's for AVR based Arduinos only. This macro can save a lots of RAM, if you are using lots of literals.

有时候我用这个:

template <class T> inline Print & operator<<(Print & p, const T & val) {
  p.print(val);
  return p;
}

// ...

Serial << F("Text ") << intVar << F("...") << "\n";

它分别打印每个部分，没有级联.

It prints each part separately, no concatenations or so.

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