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Arduino/build/shared/examples/8.Strings/StringComparisonOperators/StringComparisonOperators.pde
2010-07-27 19:03:52 +00:00

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/*
Comparing Strings
Examples of how to compare strings using the comparison operators
The circuit: No external hardware needed.
created 27 July 2010
by Tom Igoe
This example code is in the public domain.
*/
String stringOne, stringTwo;
void setup() {
Serial.begin(9600);
stringOne = String("this");
stringTwo = String("that");
Serial.println("\n\nAdding strings together (concatenation):");
}
void loop() {
// two strings equal:
if (stringOne == "this") {
Serial.println("StringOne == \"this\"");
}
// two strings not equal:
if (stringOne != stringTwo) {
Serial.println(stringOne + " =! " + stringTwo);
}
// two strings not equal (case sensitivity matters):
stringOne = "This";
stringTwo = "this";
if (stringOne != stringTwo) {
Serial.println(stringOne + " =! " + stringTwo);
}
// a numeric string compared to the number it represents:
stringOne = "1";
int numberOne = 1;
if (stringOne == numberOne) {
Serial.println(stringOne + " = " + numberOne);
}
// two numeric strings compared:
stringOne = "2";
stringTwo = "1";
if (stringOne >= stringTwo) {
Serial.println(stringOne + " >= " + stringTwo);
}
// comparison operators can be used to compare strings for alphabetic sorting too:
stringOne = String("Brown");
if (stringOne < "Charles") {
Serial.println(stringOne + " < Charles");
}
if (stringOne > "Adams") {
Serial.println(stringOne + " > Adams");
}
if (stringOne <= "Browne") {
Serial.println(stringOne + " <= Browne");
}
if (stringOne >= "Brow") {
Serial.println(stringOne + " >= Brow");
}
// do nothing while true:
while(true);
}