String Case Change Functions

This example shows how to change the case of a string using toUpperCase() and toLowerCase() functions. They work just as their names imply. toUpperCase() changes the whole string to upper case characters, and toLowerCase() changes the whole String to lower case characters. Only the characters A to Z or a to z are affected.

Relevant Groundwork

None

Hardware Required

MSP-EXP430G2 LaunchPad

Circuit

Only LaunchPad is required for this example.

Image developed using Fritzing. For more circuit examples, see the Fritzing project page.

Schematic

Code Explanation

In the program, we first declare two strings. We then change the first string to upper case and the second string to lower case.

Code

/*
  String Case changes

 Examples of how to change the case of a string

 created 27 July 2010
 modified 2 Apr 2012
 by Tom Igoe

 This example code is in the public domain.
 */

void setup() {
  // Open serial communications and wait for port to open:
  Serial.begin(9600);

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

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

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

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

Working Video

Try it out

Change case of multiple strings and print to serial.