Hi,
So you have;
7 buttons numbered 0, 1, 2, 3, 4, 5, 6
A 7 segment display as output, displaying the value of each button as it is pushed.
Yes it is possible, what model Arduino do you have?
Does it have enough input/output pins.
7 input and 7 output pins will be required.
If not enough pins available, there are methods to use a limited number of I/O.
What 7 segment display do you have, common anode or common cathode?
Looking at your history, you have written code before, so to start write some code that reads each of your 6 buttons and uses Serial monitor to show what button is pressed?
Thanks.. Tom... 
