///////////////////////////////////////////////////////
//
//	decisions.cpp
//
//	Started 1/6/97 by Jeff Ondich
//	Last modified: 1/6/97
//
//	1.  Read through this program and predict its behavior.
//		Compile it and run it several times with varying
//		input.  Can you get all of the different output
//		messages?
//
//	2.	If you comment out the "#include <ctype.h>" line,
//		which symbols does the compiler fail to recognize?
//
//	3.	isalpha() and isdigit() are two of several very
//		useful character-related functions available via
//		the ctype.h header file.  Type "man ctype" at the
//		UNIX prompt to see the list of available functions.
//
//	4.	Note the defined constant "kMaxStringLength".  I will
//		normally name my defined constants in this way,
//		starting with a "k".  This helps distinguish
//		constants from variables.  When (if) I use global
//		variables, their names will start with "g".
//		These conventions are commonly used by professional
//		programmers, and some companies even require their
//		programmers to use conventions of this sort.
//
////////////////////////////////////////////////////////

#include	<iostream.h>
#include	<ctype.h>

const int	kMaxStringLength = 20;

int main( void )
{
	//
	// Part I.  Playing with a string.
	//

	char	aString[kMaxStringLength];
	
	cout << "Type something: ";
	cin.getline( aString, kMaxStringLength );

	cout << "Your string is " << strlen(aString) << " characters long." << endl;

	if( strlen(aString) == 0 )
	{
		cout << "Yow! That's a short string." << endl;
	}
	else if( isupper(aString[0]) )
	{
		cout << "Yipee!  Your string's first character is a capital letter!\n";
	}
	else if( isdigit(aString[0])  ||  islower(aString[0]) )
	{
		cout << "Oooh!  A digit or a small letter at the beginning!" << endl;
	}
	else
	{
		cout << "No letters, no digits.  Woe is me." << endl;
	}
	
	
	//
	// Part II.  Playing with a character.
	//
	
	char	c;
	
	cout << endl << "One character, please: ";
	cin >> c;
	
	switch( c )
	{
	case 'A':
	case 'a':
		cout << "That's a good beginning letter." << endl;
		break;
	
	case '!':
		cout << "UNIX programmers often say \"bang\" when they mean \"!\"." << endl;
		break;
	
	case '?':
		cout << "I don't know either." << endl;
		break;
		
	default:
		cout << "I have nothing to say about that character." << endl;
		break;
	}
	

	return( 0 );
}