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// FILE: bag4demo.cxx
// Demonstration program for the 4th version of the bag
// (from bag4.h and bag4.template).
// This is a the same as the demonstration program for bag1,
// except that we are now using a template class, and we no longer need to
// check whether the bag reaches its capacity.
#include <iostream> // Provides cout and cin
#include <cstdlib> // Provides EXIT_SUCCESS
#include "bag4.h" // Provides the bag<Item> template class
using namespace std;
using namespace main_savitch_6A;
// PROTOTYPES for functions used by this demonstration program:
void get_ages(bag<int>& ages);
// Postcondition: The user has been prompted to type in the ages of family
// members. These ages have been read and placed in the ages bag, stopping
// when the user types a negative number.
void check_ages(bag<int>& ages);
// Postcondition: The user has been prompted to type in the ages of family
// members once again. Each age is removed from the ages bag when it is typed,
// stopping when the bag is empty.
int main( )
{
bag<int> ages;
get_ages(ages);
check_ages(ages);
cout << "May your family live long and prosper." << endl;
return EXIT_SUCCESS;
}
void get_ages(bag<int>& ages)
{
int user_input; // An age from the user's family
cout << "Type the ages in your family. ";
cout << "Type a negative number when you are done:" << endl;
cin >> user_input;
while (user_input >= 0)
{
ages.insert(user_input);
cin >> user_input;
}
}
void check_ages(bag<int>& ages)
{
int user_input; // An age from the user's family
cout << "Type those ages again. Press return after each age:" << endl;
while (ages.size( ) > 0)
{
cin >> user_input;
if (ages.erase_one(user_input))
cout << "Yes, I've got that age and have removed it." << endl;
else
cout << "No, that age does not occur!" << endl;
}
}
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