C++ :: Sentinel Value To Determine Type Of Character

Write a program that will prompt a user to enter a single character, the prompting will continue till a sentinel value is entered. For each character entered perform the following tests and print out a relevant message if the character passes the test. Print out a default message if the character does not pass any of the tests.

Tests that should be in program: Punctuation, Upper Case, Digit, White Space.

Sample Run: “A”, “a”, “7”, <tab>, “?”, “$”

So far I have the following code done. The problem is that when I run the program, the first character is correctly identified. However, every character afterwards is defined as a whitespace character.

#include <iostream>
#include <cctype>
#include <cstring>
using namespace std;
int main() {
char input;
char response;

[Code] .....