int variable = 5;


void setup() {
  Serial.begin(115200);
  Serial.println("Hello");
  Serial.println("There's a common mistake that many Arduino beginners make when they want to Serial.print a variable with a label.");
  Serial.println("This first approach looks very intuitive at first. And it works in some other programming languages.");
  Serial.println("Unfortunately it doesn't work in Arduino.");
  Serial.println("But there are some alternatives that you can use.");
  Serial.println("");

  Serial.println("This will not work:");
  Serial.println(variable + "°C");
  Serial.println("The variable is: " + variable);

  Serial.println("This works:");
  Serial.print(variable);
  Serial.println("°C");
  Serial.print("The variable is: ");
  Serial.println(variable);

  Serial.println("Alternative using the Arduino String class:");
  Serial.println(String(variable) + "°C");
  Serial.println(String("The variable is: ") + variable);

  Serial.println("Alternative using snprintf and a buffer: ");
  char buffer[30];
  snprintf(buffer, 30, "%i°C", variable);
  Serial.println(buffer);
  snprintf(buffer, 30, "The variable is: %i", variable);
  Serial.println(buffer);
  //https://cplusplus.com/reference/cstdio/snprintf/
  
  Serial.println("Scroll up in the serial monitor to read everything");
}

void loop() {
  delay(10000);
}