Question

This checkpoint is intended to help you practice the syntax of class templates in C++.

It is often convenient to have a pair of items stored together (e.g., you want to have a combination of a string and an integer as the key or value of a map). For this exercise, you will create a Pair class, that is a template class allowing any two data types to be the data type of the first and second items in the pair.

Instructions
    1. The code should contain the following
        -makefile - A simple makefile for this checkpoint
        -check11b.cpp - Contains a main function to test your Pair class. You should not need to change this function.
       -pair.h - This is where you will create your pair class. Please note that for template classes, you put the method bodies right in the .h file, rather than separating them out into a .cpp file.
    2. Create the Pair class. It should be a template class with two potentially different data types as the parameters.
    3. For the Pair class create the following methods:
        -getFirst() - returns the first item
        -setFirst(value) - sets the first item to the provided value.
        -getSecond() - returns the second item
        -setSecond(value) - sets the second item to the provided value
    4. Implement a display() function on the Pair class that displays the two parts of the object in the format "first - second"

Sample Output
The following is an example of output for this program:
Please enter a first name: Eliza
Please enter a last name: Snow
The first name is: Eliza
The last name is: Snow
The complete pair is: Eliza - Snow

Please enter a number: 42
Please enter a another number: 314
The first number is: 42
The second number is: 314
The complete pair is: 42 - 314

Please enter a name: James
Please enter a score: 97
The name is: James
The score is: 97
The complete pair is: James - 97

Answer 1

/*C++ program that prompts user to enter two names, two integer type values and one name and one integer values. Print the results on console window. */
//main.cpp
#include<iostream>
#include<string>
//include Pair.h header file
#include "Pair.h"
using namespace std;
// main Function
int main()
{
   //declare two string type variables
   string first_str;
   string second_str;
   // instantiation with two strings

   cout<<"Please enter a first name: ";
   cin>>first_str;

   cout<<"Please enter a last name: ";
   cin>>second_str;
  
   Pair <string, string> p1(first_str,second_str);
   cout<<"The first name is:"<<p1.getFirst()<<endl;
   cout<<"The last name is: "<<p1.getSecond()<<endl;

   cout<<"The complete pair is:";
   p1.display();

   fflush(stdin);

   //declare two integer type variables
   int first_int;
   int second_int;
  
   cout<<"Please enter a number: ";
   cin>>first_int;

   cout<<"Please enter another number: ";
   cin>>second_int;

   Pair <int, int> p2(first_int,second_int);

   cout<<"The first number is: :"<<p2.getFirst()<<endl;
   cout<<"The second number is: "<<p2.getSecond()<<endl;
   cout<<"The complete pair is:";
   p2.display();

   fflush(stdin);

   //declare one string and one integer type variables
   string first_name;
   int second_value;
  
   cout<<"Please enter a name: ";
   cin>>first_name;

   cout<<"Please enter score: ";
   cin>>second_value;
   // instantiation with two strings
   Pair <string, int> p3(first_name,second_value);
   cout<<"The name is: :"<<p3.getFirst()<<endl;
   cout<<"The score is: "<<p3.getSecond()<<endl;
   cout<<"The complete pair is:";
   p3.display();

   system("pause");
   return 0;
}

------------------------------------------------------------------------------------------------------------------------------
/*
The Pair template class that contains the constructor
that takes two generic data types in a class template.
*/
//Pair.h
#include<iostream>
using namespace std;
// Class template with two parameters
template<class M, class N>
class Pair
{
   //generic types
private:
   M first;
   N second;

public:
   /*Generic constructor
   that takes two generic arguments*/
   Pair(M x, N y)
   {
       first = x;
       second = y;
   }
   //Set method
   void setFirst(M x)
   {
       first = x;
   }
   //Get method
   M getFirst()
   {
       return first;
   }
   void setSecond(N y)
   {
       second = y;
   }
   N getSecond()
   {
       return second;
   }
   //Function,display that prints the first and second
   //generic data type values on console window
   void display()
   {
       cout << first << "- " <<second << endl;
   }
};

------------------------------------------------------------------------------------------------------------------------------

Sample Output: