| /* | |
| String charAt() and setCharAt() | |
| Examples of how to get and set characters of a String | |
| created 27 Jul 2010 | |
| modified 2 Apr 2012 | |
| by Tom Igoe | |
| This example code is in the public domain. | |
| https://www.arduino.cc/en/Tutorial/BuiltInExamples/StringCharacters | |
| */ | |
| void setup() { | |
| // Open serial communications and wait for port to open: | |
| Serial.begin(9600); | |
| while (!Serial) { | |
| ; // wait for serial port to connect. Needed for native USB port only | |
| } | |
| Serial.println("\n\nString charAt() and setCharAt():"); | |
| } | |
| void loop() { | |
| // make a String to report a sensor reading: | |
| String reportString = "SensorReading: 456"; | |
| Serial.println(reportString); | |
| // the reading's most significant digit is at position 15 in the reportString: | |
| char mostSignificantDigit = reportString.charAt(15); | |
| String message = "Most significant digit of the sensor reading is: "; | |
| Serial.println(message + mostSignificantDigit); | |
| // add blank space: | |
| Serial.println(); | |
| // you can also set the character of a String. Change the : to a = character | |
| reportString.setCharAt(13, '='); | |
| Serial.println(reportString); | |
| // do nothing while true: | |
| while (true); | |
| } | |