StringAppendOperator \ Learning \ Wiring ALPHA 1.0 Search wiring.org.co: Language (A-Z) \ Libraries \ Environment \ Learning \ Hardware Examples: Basics, Library, Topics \ Compare Blink Digital read Serial Analog read Serial Switch Photoresistor Fade Statements and comments Setup and Loop Loop Functions Variables Integers and floats True/False Characters and Strings Character classification Datatype conversion Variable scope Arrays Vectors Split a string and convert it to numbers Bidimensional arrays Passing an array to a function Add strings together Appending to Strings Change the case of a string Characters and Strings Compare strings Create strings from other data types Evaluate, look for, and replace characters in a String length() in a String length() and trim() in a String Replace characters or substrings of a string startsWith() and endsWith() in a String Substring in a String Iteration Iterate through digital outputs Iterate through digital inputs Conditionals Logical operators Increment/Decrement Operator precedence Modulo Sine and Cosine Random LED blink LED blink sequence LED swing 7 Segment led numerical LED display Optocoupler: 4N35 Relay 120-240 VAC Light bulb: TRIAC MOSFET: IRLD024 LED Port Tone keyboard Tone melody Tone multiple Tone pitch follower Switch (button) Multiple switches Hall effect sensor distance (proximity) sensor: Parallax ping Transmissive optical sensor Shift Register: 74LS595 Ultrasonic ranger: SFR04/SFR05 Magnetic field sensor: micromag 3-axis Humidity & Temperature: Sparkfun SHT15 Humidity & Temperature: Parallax SHT11 RGB LED matrix: Sparkfun RGB LED backpack Potentiometer Photoresistor Sensor calibration Smooth sensor readings Force Resistor Air quality sensor: MQ135 Infrared ranger (distance/presence): SHARP GP2D12/120 PiezoFilm (touch/vibration): MSIUSA piezo film Phototransistor Microphone (sound sensor) Electret Microphone: Sparkfun Ambient light sensor: Sparkfun TEMT6000 ADXL335 Accelerometer: Sparkfun ADXRS610 Gyroscope: Sparkfun IDG500 Gyroscope: Sparkfun IDG1215 Gyroscope: Sparkfun IXZ500 Gyroscope: Sparkfun LISY300AL Gyroscope: Sparkfun Air pressure: Motorola Infrared ranger & LEDs Potentiometer & LED Low current sensor: Sparkfun ACS712 Current sensor: Sparkfun ACS712 RGB LED Motor speed Stretch sensor & LEDs Light sensor & LED Attending external interrupts Timer LED blink w/timer This example is for Wiring version 0027+. If you have a previous version, use the examples included with your software. If you see any errors or have comments, please let us know. Appending to Strings using the += operator and concat() by Tom Igoe Examples of how to append different data types to strings String stringOne, stringTwo; void setup() { Serial.begin(9600); stringOne = String("Sensor "); stringTwo = String("value"); Serial.println("\n\nAppending to a string:"); } 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); } Wiring is an open project initiated by Hernando Barragán. It is developed by a small team of volunteers. © Info, Processing © Info