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Arduino/build/shared/examples/8.Strings/StringLength/StringLength.pde
2010-08-01 14:18:31 +00:00

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/*
String length()
Examples of how to use length() in a String.
Open the Serial Monitor and start sending characters to see the results.
created 1 Aug 2010
by Tom Igoe
This example code is in the public domain.
*/
String txtMsg = ""; // a string for incoming text
int lastStringLength = txtString.length(); //previous lenngth of the String
void setup() {
// open the serial port:
Serial.begin(9600);
}
void loop() {
// add any incoming characters to the String:
while (Serial.available() > 0) {
char inChar = Serial.read();
txtMsg += inChar;
}
// print the message and a notice if it's changed:
if (txtMsg.length() != lastStringLength) {
Serial.println(txtMsg);
Serial.println(txtMsg.length());
// if the String's longer than 140 characters, complain:
if (txtMsg.length() < 140) {
Serial.println("That's a perfectly acceptable text message");
}
else {
Serial.println("That's too long for a text message.");
}
// note the length for next time through the loop:
lastStringLength = txtMsg.length();
}
}