Corretions and refinements to the String examples

build/linux/work/examples/08.Strings/StringAppendOperator/StringAppendOperator.ino

@@ -0,0 +1,70 @@
+/*
+  Appending to Strings using the += operator and concat()
+ 
+ Examples of how to append different data types to strings
+ 
+ created 27 July 2010
+ modified 2 Apr 2012
+ by Tom Igoe
+ 
+ http://arduino.cc/en/Tutorial/StringAppendOperator
+ 
+ This example code is in the public domain.
+ */
+String stringOne, stringTwo;
+
+void setup() {
+  // Open serial communications and wait for port to open:
+  Serial.begin(9600);
+  // this check is only needed on the Leonardo:
+  while (!Serial) ;
+  ;
+
+  stringOne = String("Sensor ");
+  stringTwo = String("value");
+  Serial.println("\n\nAppending to a string:");
+}
+
+void loop() {
+  Serial.println(stringOne);  // prints  "Sensor "
+
+  // adding a string to a string:
+  stringOne += stringTwo;
+  Serial.println(stringOne);  // prints "Sensor value"
+
+  // adding a constant string to a string:
+  stringOne += " for input ";
+  Serial.println(stringOne);  // prints "Sensor value for input"
+
+  // adding a constant character to a string:
+  stringOne += 'A';
+  Serial.println(stringOne);   // prints "Sensor value for input A"
+
+  // adding a constant integer to a string:
+  stringOne += 0;
+  Serial.println(stringOne);   // prints "Sensor value for input A0"
+
+  // adding a constant string to a string:
+  stringOne += ": ";
+  Serial.println(stringOne);  // prints "Sensor value for input"
+
+  // adding a variable integer to a string:
+  stringOne += analogRead(A0);
+  Serial.println(stringOne);   // prints "Sensor value for input A0: 456" or whatever analogRead(A0) is
+
+  Serial.println("\n\nchanging the Strings' values");
+  stringOne = "A long integer: ";
+  stringTwo = "The millis(): ";
+
+  // adding a constant long integer to a string:
+  stringOne += 123456789;
+  Serial.println(stringOne);   // prints "A long integer: 123456789"
+
+  // using concat() to add a long variable to a string:
+  stringTwo.concat(millis());
+  Serial.println(stringTwo); // prints "The millis(): 43534" or whatever the value of the millis() is
+
+  // do nothing while true:
+  while(true);
+}
+