Positive Decimal Integer Grammar

positive-decimal-integer 
   1-9
   positive-decimal-integer 0-9
   
1-9
   1
   2
   3
   4
   5
   6
   7
   8
   9
 
0-9
   0
   1-9
   

Decimal Integer Grammar

decimal-integer
   positive-decimal-integer
   0
   - positive-decimal-integer