//This program demonstrates how characters can be 
//compared with the relational operators.
#include <iostream>
using namespace std;

int main()
{
	char ch;
	
	//Get a character from the user.
	cout << "Enter a digit or a letter: ";
	ch = cin.get();
	
	//Determine what the user entered.
	if (ch >= '0' && ch <= '9')
		cout << "You entered a digit.\n";
	else if (ch >= 'A' && ch <= 'Z')
		cout << "You entered an uppercase letter.\n";
	else if (ch >= 'a' && ch <= 'z')
		cout << "You entered a lowercase letter.\n";
	else 
		cout << "That is not a digit or a letter.\n";
	
	return 0;
}