Question

I've written this program in C++ to compare 2 pizzas using classes and it works fine. I need to convert it to java using both buffered reader and scanner and can't get either to work.

//C++ driver class for Pizza program

#include <iostream>

#include <string>

#include <algorithm>

#include <iomanip>

using std::cout;

using std::cin;

using std::string;

using std::endl;

using std::transform;

using std::setprecision;

using std::ios;

using std::setiosflags;

#include "Pizza.h"

int main()

{

            char response = 'Y';

            while (response == 'Y')

            {          

                  //info for first pizza

                  Pizza pizza1;

                  pizza1.obtainPizzaInfo();

                  pizza1.displayCost();

                 

                  //info for second pizza

                  Pizza pizza2;

                  pizza2.obtainPizzaInfo();

                  pizza2.displayCost();

           

                  if (pizza1.calcPriceSqIn()== pizza2.calcPriceSqIn())

                  {

                        pizza1.displayBestDeal("both");

                  }

                  else

                  {

                        if (pizza1.calcPriceSqIn() < pizza2.calcPriceSqIn())

                        {

                              pizza1.displayBestDeal("first");

                        }

                        else

                        {

                              pizza2.displayBestDeal("second");

                        }//end if for unequal costs

                  }//end if for equal costs

     

            cout << "Do you want to compare more pizzas?" << endl;

            cin >> response;

            response = toupper(response);

      }//end while for response

}//end main

//class declaration (header file)

class Pizza

{

private:

            int size;

            string shape;

            double price;

     

public:

            //constructor prototypes

            Pizza();

            Pizza(int, string, double);

            //accessor prototypes

            int getSize();

            string getShape();

            double getPrice();

            //mutator prototypes

            void setSize(int);

            void setShape(string);

            void setPrice(double);

            //facilitator prototypes

            double calcSqInches();

            double calcPriceSqIn();

            void displayCost();

            void displayBestDeal(string);

            void obtainPizzaInfo();

};

//implementation section

      //constructors

Pizza::Pizza()

      {

      }//end of default constructor

Pizza::Pizza(int sz, string sh, double pr)

      {

            size = sz;

            shape = sh;

            price = pr;

      }//end of overloaded constructor

      //accessors

int Pizza::getSize()

      {

            return size;

      }//end of getSize

string Pizza::getShape()

      {

            return shape;

      }//end of getShape

double Pizza::getPrice()

      {

            return price;

      }//end of getPrice

      //mutators

void Pizza::setSize(int sz)

      {

            size = sz;

      }//end of setSize

void Pizza::setShape(string sh)

      {

            shape = sh;

      }//end of setShape

void Pizza::setPrice(double pr)

      {

            price = pr;

      }//end of setPrice

      //facilitators

double Pizza::calcSqInches()

      {

            double sqInches;

            double radius = size/2;

            const double pi = 3.142;

            if (shape=="square")

                  {

                        sqInches = size * size;

                  }

            else

                  {

                        sqInches = pi * radius * radius;

                  }

            return sqInches;

      }//end of calcSqInches

double Pizza::calcPriceSqIn()

      {

            double priceSqIn;

            priceSqIn = price/calcSqInches();

            return priceSqIn;

      }//end of calcPriceSqIn

void Pizza::displayCost()

      {

            //set all numeric output to 2 decimal places

            cout << setiosflags(ios::fixed) << setprecision(2);

            double sqInches = calcSqInches();

            cout << "This pizza is " << sqInches << " square inches." << endl;

            cout << "The cost per square inch of this " << shape << " pizza is $" << calcPriceSqIn()<< endl;

      }//end of displayCost

void Pizza::displayBestDeal(string which)

      {

            if (which == "both")

            {

                  cout << "The cost of both pizzas are the same." << endl;

                  cout << "Both pizzas cost $" << calcPriceSqIn() << " per square inch" << endl;

            }

            else

            {

                  cout << "The " << number << " (" << shape << ", " << size << "-inch) pizza is the best deal." << endl;

            }

      }//end displayBestDeal

void Pizza::obtainPizzaInfo()

{

            //information for pizza 1

            cout << "Enter the size of this pizza: ";

            cin >> size;

            cout << "Enter the price of this pizza: ";

            cin >> price;

            cout << "Enter the shape of this pizza: ";     

            cin.ignore(100, '\n');

            getline(cin, shape);

            transform(shape.begin(), shape.end(), shape.begin(), tolower);         

           

            while (shape != "round" && shape != "square")

            {

                  cout << "The shape must be round or square." << endl;

                  cout << "Enter the shape of this pizza again: " << endl;

                  getline(cin, shape);

                  transform(shape.begin(), shape.end(), shape.begin(), tolower);

            }//end while for shape

}

Answer 1

// Pizza.java : Java program for Pizza program using Scanner
import java.util.Scanner;

public class Pizza {
  
   private int size;
   private String shape;
   private double price;
   //constructors
   // default constructor
   public Pizza()
   {
       size = 0;
       shape="";
       price = 0;
   }
  
   // overloaded constructor
   public Pizza(int sz, String sh, double pr)
   {
       size = sz;
shape = sh;
price = pr;
   }
  
   //accessors
   // getSize returns the size of pizza
   public int getSize()
   {
       return size;
   }
  
   // getShape returns shape of the pizza
   public String getShape()
   {
       return shape;
   }

   // getPrice returns the price of the pizza
   public double getPrice()
   {
       return price;
   }
  
   // mutators
   // setSize sets the size of pizza
   public void setSize(int sz)
   {
       size = sz;
   }
  
   // setShape sets the shape of the pizza
   public void setShape(String sh)
   {
       shape = sh;
   }
  
   //setPrice sets the price of pizza
   public void setPrice(double pr)
   {
       price = pr;
   }
  
   //facilitators
   // returns the area of the pizza
   public double calcSqInches()
   {
       double sqInches;
double radius = size/2;
final double pi = 3.142;
if (shape=="square")
{
   sqInches = size * size;
}
else
{
   sqInches = pi * radius * radius;
}

return sqInches;
   }
  
   // returns price per square inch
   public double calcPriceSqIn()
   {
       double priceSqIn;
priceSqIn = price/calcSqInches();
return priceSqIn;
   }
  
   // display the cost of the pizza
   public void displayCost()
   {
       double sqInches = calcSqInches();

System.out.printf("This pizza is %.2f square inches.\n", sqInches);
System.out.printf("The cost per square inch of this %s pizza is $%.2f\n",shape,calcPriceSqIn());
   }
  
   public void displayBestDeal(String which)
   {
       if (which == "both")
       {
           System.out.println("The cost of both pizzas are the same.");
           System.out.printf("Both pizzas cost $%.2f per square inch\n",calcPriceSqIn());
}
else
{
System.out.printf("The %s (%s, %d-inch) pizza is the best deal.\n",which,shape,size);
}
   }
  
   // method to obtain information of the pizza
   public void obtainPizzaInfo()
   {
       //information for pizza 1
       Scanner scan = new Scanner(System.in);
System.out.print("Enter the size of this pizza: ");
size = scan.nextInt();
System.out.print("Enter the price of this pizza: ");
price = scan.nextDouble();
scan.nextLine();
System.out.print("Enter the shape of this pizza: ");   
shape = scan.nextLine();
  
while ((!shape.equalsIgnoreCase("round")) && (!shape.equalsIgnoreCase("square")))
{
System.out.println("The shape must be round or square.");
System.out.print("Enter the shape of this pizza again: ");
shape = scan.nextLine();
}//end while for shape
   }
  
   public static void main(String[] args) {
      
       Scanner scan = new Scanner(System.in);
       String response= "y";
      
       while(response.equalsIgnoreCase("y"))
       {
           //info for first pizza
Pizza pizza1 = new Pizza();
pizza1.obtainPizzaInfo();
pizza1.displayCost();

//info for second pizza
Pizza pizza2 = new Pizza();
pizza2.obtainPizzaInfo();
pizza2.displayCost();
  
if (pizza1.calcPriceSqIn()== pizza2.calcPriceSqIn())
{
pizza1.displayBestDeal("both");
}
else
{
if (pizza1.calcPriceSqIn() < pizza2.calcPriceSqIn())
{
pizza1.displayBestDeal("first");
}
else
{
pizza2.displayBestDeal("second");

}//end if for unequal costs

}//end if for equal costs
  
System.out.print("Do you want to compare more pizzas (y/n) ? ");
response = scan.nextLine();
       }

scan.close();
      
   }

}

//end of Pizza.java

Output:

2.

// Pizza.java : Java program for Pizza program using BufferedReader
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Pizza {
  
   private int size;
   private String shape;
   private double price;
   //constructors
   // default constructor
   public Pizza()
   {
       size = 0;
       shape="";
       price = 0;
   }
  
   // overloaded constructor
   public Pizza(int sz, String sh, double pr)
   {
       size = sz;
shape = sh;
price = pr;
   }
  
   //accessors
   // getSize returns the size of pizza
   public int getSize()
   {
       return size;
   }
  
   // getShape returns shape of the pizza
   public String getShape()
   {
       return shape;
   }

   // getPrice returns the price of the pizza
   public double getPrice()
   {
       return price;
   }
  
   // mutators
   // setSize sets the size of pizza
   public void setSize(int sz)
   {
       size = sz;
   }
  
   // setShape sets the shape of the pizza
   public void setShape(String sh)
   {
       shape = sh;
   }
  
   //setPrice sets the price of pizza
   public void setPrice(double pr)
   {
       price = pr;
   }
  
   //facilitators
   // returns the area of the pizza
   public double calcSqInches()
   {
       double sqInches;
double radius = size/2;
final double pi = 3.142;
if (shape=="square")
{
   sqInches = size * size;
}
else
{
   sqInches = pi * radius * radius;
}

return sqInches;
   }
  
   // returns price per square inch
   public double calcPriceSqIn()
   {
       double priceSqIn;
priceSqIn = price/calcSqInches();
return priceSqIn;
   }
  
   // display the cost of the pizza
   public void displayCost()
   {
       double sqInches = calcSqInches();

System.out.printf("This pizza is %.2f square inches.\n", sqInches);
System.out.printf("The cost per square inch of this %s pizza is $%.2f\n",shape,calcPriceSqIn());
   }
  
   public void displayBestDeal(String which)
   {
       if (which == "both")
       {
           System.out.println("The cost of both pizzas are the same.");
           System.out.printf("Both pizzas cost $%.2f per square inch\n",calcPriceSqIn());
}
else
{
System.out.printf("The %s (%s, %d-inch) pizza is the best deal.\n",which,shape,size);
}
   }
  
   // method to obtain information of the pizza
   public void obtainPizzaInfo() throws IOException
   {
       //information for pizza 1
       BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
System.out.print("Enter the size of this pizza: ");
size = Integer.parseInt(reader.readLine());
System.out.print("Enter the price of this pizza: ");
price = Double.parseDouble(reader.readLine());
//scan.nextLine();
System.out.print("Enter the shape of this pizza: ");   
shape = reader.readLine();
  
while ((!shape.equalsIgnoreCase("round")) && (!shape.equalsIgnoreCase("square")))
{
System.out.println("The shape must be round or square.");
System.out.print("Enter the shape of this pizza again: ");
shape = reader.readLine();
}//end while for shape
   }
  
   public static void main(String[] args) throws IOException {
      
       BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
       String response= "y";
      
       while(response.equalsIgnoreCase("y"))
       {
           //info for first pizza
Pizza pizza1 = new Pizza();
pizza1.obtainPizzaInfo();
pizza1.displayCost();

//info for second pizza
Pizza pizza2 = new Pizza();
pizza2.obtainPizzaInfo();
pizza2.displayCost();
  
if (pizza1.calcPriceSqIn()== pizza2.calcPriceSqIn())
{
pizza1.displayBestDeal("both");
}
else
{
if (pizza1.calcPriceSqIn() < pizza2.calcPriceSqIn())
{
pizza1.displayBestDeal("first");
}
else
{
pizza2.displayBestDeal("second");

}//end if for unequal costs

}//end if for equal costs
  
System.out.print("Do you want to compare more pizzas (y/n) ? ");
response = reader.readLine();
       }
      
       reader.close();
      
   }

}

//end of program

Output: