What user input validation rules you would include in the (Painting Company) application that paints areas, uses paint in lbs, and charges the client...

What user input validation rules you would include in the  (Painting Company) application that paints areas, uses paint in lbs, and charges the client for square feet,  validation rules like quantity of paint, labor charges ( Hours), or Number Must Be an Integer like painting area, etc... can you please be specific in your answer....