mirror of
https://github.com/arduino/Arduino.git
synced 2024-12-02 13:24:12 +01:00
74 lines
2.0 KiB
C++
74 lines
2.0 KiB
C++
/*
|
|
Appending to Strings using the += operator and concat()
|
|
|
|
Examples of how to append different data types to strings
|
|
|
|
created 27 July 2010
|
|
modified 2 Apr 2012
|
|
by Tom Igoe
|
|
|
|
http://www.arduino.cc/en/Tutorial/StringAppendOperator
|
|
|
|
This example code is in the public domain.
|
|
*/
|
|
|
|
String stringOne, stringTwo;
|
|
|
|
void setup() {
|
|
// Open serial communications and wait for port to open:
|
|
Serial.begin(9600);
|
|
while (!Serial) {
|
|
; // wait for serial port to connect. Needed for Leonardo only
|
|
}
|
|
|
|
stringOne = String("Sensor ");
|
|
stringTwo = String("value");
|
|
// send an intro:
|
|
Serial.println("\n\nAppending to a string:");
|
|
Serial.println();
|
|
}
|
|
|
|
void loop() {
|
|
Serial.println(stringOne); // prints "Sensor "
|
|
|
|
// adding a string to a string:
|
|
stringOne += stringTwo;
|
|
Serial.println(stringOne); // prints "Sensor value"
|
|
|
|
// adding a constant string to a string:
|
|
stringOne += " for input ";
|
|
Serial.println(stringOne); // prints "Sensor value for input"
|
|
|
|
// adding a constant character to a string:
|
|
stringOne += 'A';
|
|
Serial.println(stringOne); // prints "Sensor value for input A"
|
|
|
|
// adding a constant integer to a string:
|
|
stringOne += 0;
|
|
Serial.println(stringOne); // prints "Sensor value for input A0"
|
|
|
|
// adding a constant string to a string:
|
|
stringOne += ": ";
|
|
Serial.println(stringOne); // prints "Sensor value for input"
|
|
|
|
// adding a variable integer to a string:
|
|
stringOne += analogRead(A0);
|
|
Serial.println(stringOne); // prints "Sensor value for input A0: 456" or whatever analogRead(A0) is
|
|
|
|
Serial.println("\n\nchanging the Strings' values");
|
|
stringOne = "A long integer: ";
|
|
stringTwo = "The millis(): ";
|
|
|
|
// adding a constant long integer to a string:
|
|
stringOne += 123456789;
|
|
Serial.println(stringOne); // prints "A long integer: 123456789"
|
|
|
|
// using concat() to add a long variable to a string:
|
|
stringTwo.concat(millis());
|
|
Serial.println(stringTwo); // prints "The millis(): 43534" or whatever the value of the millis() is
|
|
|
|
// do nothing while true:
|
|
while (true);
|
|
}
|
|
|