hello guys.. i am not used to do arduino or any microcontroller programming, i have a project that was instructed to let the 7 segment common anode display (single digit) to count from '9' to 'blank' display.. it was like "9-8-7-6-5-4-3-2-1-0-blank", and when it reached the blank display, a push button switch will be used to reset the counting back to 9. please help me. 
Thank you!
Just google "Arduino 7 segment display code". I did that and got 148,000 hits. One of those will likely be perfect.
How is the display wired to the Arduino ?
Do you know how to display a number on the 7 segment display ?