arduino-0022

arduino-0022-linux-x64/examples/8.Strings/StringComparisonOperators/StringComparisonOperators.pde

@@ -0,0 +1,124 @@
+/*
+  Comparing Strings 
+ 
+ Examples of how to compare strings using the comparison operators
+ 
+ created 27 July 2010
+ modified 4 Sep 2010
+ by Tom Igoe
+ 
+ http://arduino.cc/en/Tutorial/StringComparisonOperators
+ 
+ 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\nComparing Strings:");
+
+}
+
+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);
+  }
+  // you can also use equals() to see if two strings are the same:
+  if (stringOne.equals(stringTwo)) {
+    Serial.println(stringOne + " equals " + stringTwo);
+  } 
+  else {
+    Serial.println(stringOne + " does not equal " + stringTwo);
+  }
+
+  // or perhaps you want to ignore case:
+  if (stringOne.equalsIgnoreCase(stringTwo)) {
+    Serial.println(stringOne + " equals (ignoring case) " + stringTwo);
+  } 
+  else {
+    Serial.println(stringOne + " does not equal (ignoring case) " + 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"); 
+  }
+
+  // the compareTo() operator also allows you to compare strings
+  // it evaluates on the first character that's different.
+  // if the first character of the string you're comparing to
+  // comes first in alphanumeric order, then compareTo() is greater than 0:
+  stringOne = "Cucumber";
+  stringTwo = "Cucuracha";
+  if (stringOne.compareTo(stringTwo) < 0 ) {
+    Serial.println(stringOne + " comes before " + stringTwo); 
+  } 
+  else {
+    Serial.println(stringOne + " comes after " + stringTwo);    
+  }
+
+  delay(10000);  // because the next part is a loop:
+
+  // compareTo() is handy when you've got strings with numbers in them too:
+
+  while (true) {
+    stringOne = "Sensor: ";
+    stringTwo= "Sensor: ";
+
+    stringOne += analogRead(A0); 
+    stringTwo += analogRead(A5);
+
+    if (stringOne.compareTo(stringTwo) < 0 ) {
+      Serial.println(stringOne + " comes before " + stringTwo); 
+    } 
+    else {
+      Serial.println(stringOne + " comes after " + stringTwo); 
+
+    }
+  }
+}