String length() and trim() Commands

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1/*
2  String length() and trim()
3
4  Examples of how to use length() and trim() in a String
5
6  created 27 Jul 2010
7  modified 2 Apr 2012
8  by Tom Igoe
9
10  This example code is in the public domain.
11
12  https://www.arduino.cc/en/Tutorial/StringLengthTrim
13*/
14
15void setup() {
16  // Open serial communications and wait for port to open:
17  Serial.begin(9600);
18  while (!Serial) {
19    ; // wait for serial port to connect. Needed for native USB port only
20  }
21
22  // send an intro:
23  Serial.println("\n\nString length() and trim():");
24  Serial.println();
25}
26
27void loop() {
28  // here's a String with empty spaces at the end (called white space):
29  String stringOne = "Hello!       ";
30  Serial.print(stringOne);
31  Serial.print("<--- end of string. Length: ");
32  Serial.println(stringOne.length());
33
34  // trim the white space off the string:
35  stringOne.trim();
36  Serial.print(stringOne);
37  Serial.print("<--- end of trimmed string. Length: ");
38  Serial.println(stringOne.length());
39
40  // do nothing while true:
41  while (true);
42}