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According to #3786 removed the reference to Leonardo only in while(!Serial) of the examples. Changed in in "wait for serial port to connect. Needed for native USB port only"
129 lines
3.2 KiB
C++
129 lines
3.2 KiB
C++
/*
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Comparing Strings
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Examples of how to compare strings using the comparison operators
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created 27 July 2010
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modified 2 Apr 2012
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by Tom Igoe
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http://www.arduino.cc/en/Tutorial/StringComparisonOperators
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This example code is in the public domain.
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*/
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String stringOne, stringTwo;
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void setup() {
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// Open serial communications and wait for port to open:
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Serial.begin(9600);
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while (!Serial) {
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; // wait for serial port to connect. Needed for native USB port only
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}
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stringOne = String("this");
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stringTwo = String("that");
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// send an intro:
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Serial.println("\n\nComparing Strings:");
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Serial.println();
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}
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void loop() {
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// two strings equal:
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if (stringOne == "this") {
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Serial.println("StringOne == \"this\"");
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}
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// two strings not equal:
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if (stringOne != stringTwo) {
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Serial.println(stringOne + " =! " + stringTwo);
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}
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// two strings not equal (case sensitivity matters):
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stringOne = "This";
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stringTwo = "this";
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if (stringOne != stringTwo) {
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Serial.println(stringOne + " =! " + stringTwo);
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}
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// you can also use equals() to see if two strings are the same:
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if (stringOne.equals(stringTwo)) {
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Serial.println(stringOne + " equals " + stringTwo);
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} else {
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Serial.println(stringOne + " does not equal " + stringTwo);
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}
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// or perhaps you want to ignore case:
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if (stringOne.equalsIgnoreCase(stringTwo)) {
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Serial.println(stringOne + " equals (ignoring case) " + stringTwo);
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} else {
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Serial.println(stringOne + " does not equal (ignoring case) " + stringTwo);
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}
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// a numeric string compared to the number it represents:
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stringOne = "1";
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int numberOne = 1;
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if (stringOne.toInt() == numberOne) {
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Serial.println(stringOne + " = " + numberOne);
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}
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// two numeric strings compared:
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stringOne = "2";
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stringTwo = "1";
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if (stringOne >= stringTwo) {
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Serial.println(stringOne + " >= " + stringTwo);
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}
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// comparison operators can be used to compare strings for alphabetic sorting too:
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stringOne = String("Brown");
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if (stringOne < "Charles") {
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Serial.println(stringOne + " < Charles");
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}
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if (stringOne > "Adams") {
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Serial.println(stringOne + " > Adams");
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}
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if (stringOne <= "Browne") {
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Serial.println(stringOne + " <= Browne");
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}
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if (stringOne >= "Brow") {
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Serial.println(stringOne + " >= Brow");
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}
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// the compareTo() operator also allows you to compare strings
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// it evaluates on the first character that's different.
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// if the first character of the string you're comparing to
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// comes first in alphanumeric order, then compareTo() is greater than 0:
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stringOne = "Cucumber";
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stringTwo = "Cucuracha";
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if (stringOne.compareTo(stringTwo) < 0) {
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Serial.println(stringOne + " comes before " + stringTwo);
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} else {
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Serial.println(stringOne + " comes after " + stringTwo);
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}
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delay(10000); // because the next part is a loop:
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// compareTo() is handy when you've got strings with numbers in them too:
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while (true) {
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stringOne = "Sensor: ";
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stringTwo = "Sensor: ";
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stringOne += analogRead(A0);
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stringTwo += analogRead(A5);
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if (stringOne.compareTo(stringTwo) < 0) {
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Serial.println(stringOne + " comes before " + stringTwo);
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} else {
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Serial.println(stringOne + " comes after " + stringTwo);
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}
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}
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}
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