////////////////////////////////////////////////////////
//
//	parameters.cpp
//
//	Started by Zeff Ondich on 9/25/00
//	Last modified 9/27/00
//
//	This program illustrates value vs. reference
//	parameters.
//
////////////////////////////////////////////////////////

#include	<iostream>
#include	<string>

////////////////////////////////////////////////
// Interfaces.
////////////////////////////////////////////////

void GetAgeAndName( int& age, string& name );
int Square( int n );
void DestroyJs( string& s );
int CountJs( const string& s );


////////////////////////////////////////////////
// Main program
////////////////////////////////////////////////

int main( void )
{
	int			userAge;
	string		userName;

	GetAgeAndName( userAge, userName );

	cout << "The square of your age is " << Square( userAge ) << "." << endl;

	cout << "Your name contains " << CountJs( userName )
		 << " of the evil letter 'J'." << endl;

	DestroyJs( userName );
	cout << "Your improved name is '" << userName
		 << "', which contains " << CountJs( userName )
		 << " of the evil letter 'J'." << endl;

	return( 0 );
}

int Square( int n )
{
	return( n*n );
}

void GetAgeAndName( int& age, string& name )
{
	cout << "What's your name? ";
	cin >> name;

	cout << "How old are you? ";
	cin >> age;
}

void DestroyJs( string& s )
{
	int i;
	int length = s.length();
	for( i=0; i < length; i++ )
	{
		if( toupper(s[i]) == 'J' )
			s[i] = 'Z';
	}
}

int CountJs( const string& s )
{
	int		i;
	int		jCount = 0;
	int		length = s.length();

	for( i=0; i < length; i++ )
	{
		if( toupper(s[i]) == 'J' )
			jCount++;
	}

	return( jCount );
}