ESP8266 Community Forum

- Fri Sep 10, 2021 11:11 am #92302 Very basic bit of code:

Code: Select allint initFunc() {
}

void setup() {
  Serial.begin(19200);
  initFunc();
}

void loop() {
}

So initFunc should return an int but doesn't, but setup ignores the return value. In C, this would generate a
warning: control reaches end of non-void function [-Wreturn-type]
but runs fine.
On Arduino/ESP8266 it compiles fine, but then triggers an exception, which seems extreme. Is there a logic to this that I'm missing, or is it a bug?
Using board 3.0.2 and Arduino 1.8.13

- Thu Sep 16, 2021 12:46 pm #92359

Very basic bit of code:

Code: Select allint initFunc() {
}

void setup() {
  Serial.begin(19200);
  initFunc();
}

void loop() {
}

So initFunc should return an int but doesn't, but setup ignores the return value. In C, this would generate a
warning: control reaches end of non-void function [-Wreturn-type]
but runs fine.
On Arduino/ESP8266 it compiles fine, but then triggers an exception, which seems extreme. Is there a logic to this that I'm missing, or is it a bug?
Using board 3.0.2 and Arduino 1.8.13

How must insert in the fuction "return", like that:

int function(void){


return 0; // Or other int value

}

If the function dont need returna a value, you must declare by "void", like that:

void function(void){


}

- Mon Oct 25, 2021 6:05 am #92713 I know that's what I should do, but not doing it seems a very minor error to crash the ESP. In C, the function would simply return an undefined int value, and the calling routine would ignore it