User interface contains two types of user input controls: TextInput, which accepts all characters and NumericInput, which accepts only digits.
Implement the class TextInput that contains:
- Public sub Add(c As Char) - adds the given character to the current value
- Public function GetValue() As String - returns the current value
Implement the class NumericInput that:
- Inherits TextInput
- Overrides the Add method so that each non-numeric character is ignored
For example, the following code should output "10":
Dim input As TextInput = New NumericInput()
input.Add(CChar("1"))
input.Add(CChar("a"))
input.Add(CChar("0"))
Console.WriteLine(input.GetValue())
- Example case: System.InvalidCastException
- Adding various characters to TextInput: System.NullReferenceException
- Adding numeric characters to NumericInput: System.InvalidCastException
- Adding various characters to NumericInput: System.InvalidCastException
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