return
Description
Terminate a function and return a value from a function to the calling function, if desired.
Syntax
return; // used when the returned type of function is void
return value; // used when the returned type of function is not void
Parameter Values
- 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
return;
// the rest of a dysfunctional sketch here
// this code will never be executed
}
Testing Example
void setup() {
Serial.begin(9600);
printMessage();
}
void loop() {
}
void printMessage() {
Serial.println("Hello, ArduinoGetStarted.com");
return;
Serial.println("Hi, ArduinoGetStarted.com");
}
The result on Serial Monitor:
8
Serial.println("Hello World!");
Message (Enter to send message to 'Arduino Uno' on 'COM15')
New Line
9600 baud
Hello, ArduinoGetStarted.com
As we can see, the text after return is not printed.
See Also
- Language : break
- Language : continue
- Language : do...while
- Language : else
- Language : for
- Language : goto
- Language : if
- Language : switch...case
- Language : while
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