"was not declared in this scop" error

Forum 2005-2010 (read only) General Frequently-Asked Questions
1

What dose this mean?

Getting it when I try and upload this code

// CountDownTest Joe Pardue 8/15/09

int seconds = 59;
int minutes = 59;     // Inititialise actual values for h,m,s

void setup () {
  // begin the serial communication
  Serial.begin(9600);
}

void loop () {

    seconds = seconds - 1;  // decrement the seconds
    tick = 0;               // reset the tick flag
    if (seconds < 0){       // If a minute has passed
      seconds = 59 ;         // Send seconds up to 59
      minutes = minutes - 1; // decrement the minutes
    }
   
    Serial.print(minutes,DEC);
    Serial.print(":");
    Serial.println(seconds,DEC);
 
    delay(1000); // wait a second
}
2

You didn't post the whole error - you should have said " In function 'void loop()':
error: 'tick' was not declared in this scope"

You have a line which says

tick = 0;               // reset the tick flag

You never initialised this variable - you did for the variables "seconds" and "minutes".

Either initialise the variable (int tick =0;), or seeing as how you don't actually use the variable tick, just delete the above line from your code.

3

Your absolutely right, I understand the error now, missed the "In function 'void loop()':" ;D

4

Btw, your code won't implement an accurate clock. All the code, not only delay(), will take some time to execute, especially Serial.println calls. So the constant delay of 1000 ms won't work. You can use millis() to calculate more accurate delay-time.

5

Thank you very much for that, Im trying to change the code to print onto 4 7-segment LEDs (but not having much luck)

But I guess I will still need to use millis() when i finally work it out, so thank you!