ok i got me a book on it i'll tell you this :
0 = 0000 0000
1 = 0000 0001
2 = 0000 0010
3 = 0000 0011
4 = 0000 0100
5 = 0000 0101
6 = 0000 0110
so 7 will be 0000 0111
etc etc etc .