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String myString;

void setup() {
  // initialize serial and wait for port to open:
  Serial.begin(9600);
  while (!Serial) {
    ; // wait for serial port to connect. Needed for native USB
  }

  myString.reserve(26);
  myString = "i=";
  myString += "1234";
  myString += ", is that ok?";

  // print the String:
  Serial.println(myString);
}

void loop() {
  // nothing to do here
}