esp8266/build/shared/examples/08.Strings/StringCaseChanges/StringCaseChanges.ino

/*
  String Case changes

 Examples of how to change the case of a string

 created 27 July 2010
 modified 2 Apr 2012
 by Tom Igoe

 http://www.arduino.cc/en/Tutorial/StringCaseChanges

 This example code is in the public domain.
 */

void setup() {
  // Open serial communications and wait for port to open:
  Serial.begin(9600);
  while (!Serial) {
    ; // wait for serial port to connect. Needed for Leonardo only
  }

  // send an intro:
  Serial.println("\n\nString  case changes:");
  Serial.println();
}

void loop() {
  // toUpperCase() changes all letters to upper case:
  String stringOne = "<html><head><body>";
  Serial.println(stringOne);
  stringOne.toUpperCase();
  Serial.println(stringOne);

  // toLowerCase() changes all letters to lower case:
  String stringTwo = "</BODY></HTML>";
  Serial.println(stringTwo);
  stringTwo.toLowerCase();
  Serial.println(stringTwo);


  // do nothing while true:
  while (true);
}