String myString1 = "Arduino";
String myString2 = "Robot";

void setup() {
  Serial.begin(9600);
  
  // 1. charAt
  char letter = myString1.charAt(2);
  Serial.print("charAt(2): ");
  Serial.println(letter);

  // 2. compareTo
  int result = myString1.compareTo(myString2);
  Serial.print("compareTo: ");
  Serial.println(result);

  // 3. concat
  String str1 = "Hello ";
  String str2 = "World";
  str1.concat(str2);
  Serial.print("concat: ");
  Serial.println(str1);

  // 4. endsWith
  bool ends = myString1.endsWith("ino");
  Serial.print("endsWith 'ino': ");
  Serial.println(ends);

  // 5. equals
  bool isEqual = myString1.equals("arduino");
  Serial.print("equals (case-sensitive): ");
  Serial.println(isEqual);

  // 6. equalsIgnoreCase
  isEqual = myString1.equalsIgnoreCase("arduino");
  Serial.print("equalsIgnoreCase: ");
  Serial.println(isEqual);

  // 7. getBytes
  byte buffer[10];
  myString1.getBytes(buffer, 7);
  Serial.print("getBytes: ");
  Serial.write(buffer, 7);
  Serial.println();

  // 8. indexOf
  int index = myString1.indexOf('d');
  Serial.print("indexOf('d'): ");
  Serial.println(index);

  // 9. lastIndexOf
  index = myString1.lastIndexOf('o');
  Serial.print("lastIndexOf('o'): ");
  Serial.println(index);

  // 10. length
  int len = myString1.length();
  Serial.print("length: ");
  Serial.println(len);

  // 11. remove (one character)
  String temp = myString1;
  temp.remove(2);
  Serial.print("remove(2): ");
  Serial.println(temp);

  // 12. remove (multiple characters)
  temp = myString1;
  temp.remove(2, 3);
  Serial.print("remove(2, 3): ");
  Serial.println(temp);

  // 13. replace
  temp = myString1;
  temp.replace('d', 't');
  Serial.print("replace('d', 't'): ");
  Serial.println(temp);

  // 14. reserve
  myString1.reserve(50);
  Serial.println("reserve(50) done");

  // 15. setCharAt
  temp = myString1;
  temp.setCharAt(2, 'x');
  Serial.print("setCharAt(2, 'x'): ");
  Serial.println(temp);

  // 16. startsWith
  bool starts = myString1.startsWith("Ard");
  Serial.print("startsWith 'Ard': ");
  Serial.println(starts);

  // 17. substring from index
  String sub = myString1.substring(3);
  Serial.print("substring(3): ");
  Serial.println(sub);

  // 18. substring with range
  sub = myString1.substring(1, 4);
  Serial.print("substring(1, 4): ");
  Serial.println(sub);

  // 19. toCharArray
  char charBuffer[10];
  myString1.toCharArray(charBuffer, 7);
  Serial.print("toCharArray: ");
  Serial.println(charBuffer);

  // 20. toFloat
  String floatString = "3.14";
  float floatValue = floatString.toFloat();
  Serial.print("toFloat: ");
  Serial.println(floatValue);

  // 21. toInt
  String intString = "123";
  int intValue = intString.toInt();
  Serial.print("toInt: ");
  Serial.println(intValue);

  // 22. toLowerCase
  temp = myString1;
  temp.toLowerCase();
  Serial.print("toLowerCase: ");
  Serial.println(temp);

  // 23. toUpperCase
  temp = myString1;
  temp.toUpperCase();
  Serial.print("toUpperCase: ");
  Serial.println(temp);

  // 24. trim
  String spacedString = "   Arduino   ";
  spacedString.trim();
  Serial.print("trim: ");
  Serial.println(spacedString);
}

void loop() {
  // No code needed for loop
}