Question on for loop

From “Fading”:

for(int fadeValue = 0 ; fadeValue <= 255; fadeValue +=5) { 
    // sets the value (range from 0 to 255):
    analogWrite(ledPin, fadeValue);         
    // wait for 30 milliseconds to see the dimming effect    
    delay(30);                            
  } 

  // fade out from max to min in increments of 5 points:
  for(int fadeValue = 255 ; fadeValue >= 0; fadeValue -=5) { 
    // sets the value (range from 0 to 255):
    analogWrite(ledPin, fadeValue);         
    // wait for 30 milliseconds to see the dimming effect    
    delay(30);                            
  }

I was just curious as to why the <= and >= operators were used rather than < and >.

Why wouldn’t the first loop be executed when the value was 255? (because it’s still in the range)

Thanks in advance

Without the = you can’t hit 255, only 254, in the case of <=255, so it would stop at 250.

So you can exit the first loop at 255, but you can not enter the first loop at 255?

Just making sure.

Thanks.

Nope, you cannot enter at 255, because in this case

for(int fadeValue = 0 ; fadeValue <= 255; fadeValue +=5) {

int fadeValue = 0 << says you are starting at 0.

If you instead had something like

for(fadeValue = OtherVariableName ; fadeValue <= 255; fadeValue +=5) {

then perhaps you could start at whatever OtherVariableName was equal to when the for:next loop started.

Okay, that makes sense.

That's what I was looking for.