Displaying initial value of variable Type Decimal as 0.00.

I have a module pool program, wherein in the table control I have one field that is of type Decimal, and is input enabled + mandatory. The problem is that the value 0.00 is to be accepted as a correct input. Moreover if the value is 0.00, then it should be displayed as 0.00. Please let me know if there is any other method of displaying this value other than changing the data type to character?..