Understanding a Loop.

Projects Programming
1

Hi,

Can some kind person explain how this loop would repeat indefinitely, please?

void loop()
{
  for (int x = 0; x < 3; x++)
  {
    if (digitalRead(buttonPins[x]) == LOW)
    {
      Serial.print("The button on pin ");
      Serial.print(buttonPins[x]);
      Serial.println(" is pressed");
    }
  }
}

What I am unsure about is how the loop works once x=3.

Does x revert back to 0 once x=3 so the loop keeps looping or does it only loop 3 times then become false and the loop stops?

Would it be better to use unsigned int?

Thanks,

Martin

2

The for loop exits when X == 3, so the loop () function exits and gets called again, so the for loop executes again from zero.

3

Hi AWOL,

Thanks very much for the reply, that makes sense now.

Would it be better to use unsigned int due to a possible overflow problem with using int?

Thanks,

Martin

4

Even a byte (unsigned char) doesn't overflow for a count of three.

5

Hi AWOL,

Thanks, they didn't really explain that in the guide. :o

Martin