[Control Structures]


Terminate a function and return a value from a function to the calling function, if desired.


return value;


value: Allowed data types: any variable or constant type.

Example Code

A function to compare a sensor input to a threshold

int checkSensor() {
  if (analogRead(0) > 400) {
    return 1;
  else {
    return 0;

The return keyword is handy to test a section of code without having to “comment out” large sections of possibly buggy code.

void loop() {
  // brilliant code idea to test here


  // the rest of a dysfunctional sketch here
  // this code will never be executed

See also

  • [Language] comments

Language Reference Home

The text of the 86Duino reference is a modification of the Arduino reference and is licensed under a Creative Commons Attribution-ShareAlike 3.0 License. Code samples in the reference are released into the public domain.

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