The user interface contains two types of user input controls: TextInput, which accepts all characters and Numeric Input, which accepts only digits.
1. Implement the class TextInput that contains:
O Public method def add(c : Char) - concatenates the given character to the current value
O Public method def getValue(): String - returns the current value
Implement the class NumericInput that:
O Inherits from TextInput
O Overrides the add method so that each non-numeric character is ignored
For example, the following code should output "10":
$input = new NumericInput();
$input->add('1');
$input->add('a');
$input->add('0');
echo $input->getValue();
The code skeleton is provided below:
<?php
class TextInput
{
}
class Numericinput
{
{
//$input = new NumericInput();
//$input->add('1');
//$input->add('a');
//$input->add('0');
//echo $input->getValue();