/* 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://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); // this check is only needed on the Leonardo: while (!Serial) ; ; Serial.println("\n\nString case changes:"); } void loop() { // toUpperCase() changes all letters to upper case: String stringOne = ""; Serial.println(stringOne); stringOne = (stringOne.toUpperCase()); Serial.println(stringOne); // toLowerCase() changes all letters to lower case: String stringTwo = ""; Serial.println(stringTwo); stringTwo = stringTwo.toLowerCase(); Serial.println(stringTwo); // do nothing while true: while(true); }