Group A-Assignment no 9

Imagine a publishing company which does marketing for book and audiocassette versions.
Create a class publication that stores the title (a string) and price (type float) of a
publication. From this class derive two classes: book, which adds a page count (type int),
and tape, which adds a playing time in minutes (type float).
Write a program that instantiates the book and tape classes, allows user to enter data and
displays the data members. If an exception is caught, replace all the data member values
with zero values.


Answer:

Follow the following steps
1.Create a base class publication.
2.title and price data members are declared as protected members.
3.write a default and parameterised  construtor in a base class to initialize data members(i.e title and price) 
4. write a derived class book which has pagecount data member.
5.write a constructor of book class which has 3 parameters from which 2 are used to initialize data members of base class and one for its own.
6.write a display function to display a members of book (title and price inherited from base class publication and pagecount(its own))
7.Follow the same steps for CD class


Program:

#include <iostream>
#include<string>
using namespace std;
class publication
{
    protected:
    string title;
    float price;
   
    public:
    publication()
    {
        title=" ";
        price=0.0;
        
        }
        publication(string t,float p)
        {
            title=t;
            price=p;
            
            }
           
            
    
    };
    class book : public publication
    {
        int pagecount;
        public:
        book()
        {
            pagecount=0;
            
        }
        //After : base class constructor is called
        book(string t,float p,int pc):publication(t,p)
        {
            
            pagecount=pc;
            
        }
     
     void display()
     {
        
          cout<<"title :"<<title<<endl;
                cout<<"Price: "<<price<<endl;
       
          cout<<"Pagecount :"<<pagecount<<endl;
         
        }
        
    };

 class CD : public publication
    {
        float time;
        public:
        CD()
        {
            time=0.0;
            
        }
        //After : base class constructor is called
        CD(string t,float p,float tim):publication(t,p)
        {
            
            time=tim;
            
        }
     
     void display()
     {
         cout<<"title :"<<title<<endl;
                cout<<"Price: "<<price<<endl;
       
          cout<<"time in minutes :"<<time<<endl;
         
        }
        
    };
int main()
{
    cout<<endl<<"Book data"<<endl;
    book b("C++",230,300);
    b.display();
    cout<<endl<<"CD Data"<<endl;
    CD c("programming",100,120.5);
    c.display();
    return 0;
        }


//OUTPUT

Book data title :C++ Price: 230 Pagecount :300 CD Data title :programming Price: 100 time in minutes :120.5  

Group A-Assignment no 5

Problem Statement:

Write a C++ program create a calculator for an arithmetic operator (+, -, *, /). The program should take two operands from user and performs the operation on those two operands depending upon the operator entered by user. Use a switch statement to select the operation. Finally, display the result. Some sample interaction with the program might look like this: Enter first number, operator, second number: 10 / 3 Answer = 3.333333 Do another (y/n)? y Enter first number, operator, second number: 12 + 100 Answer = 112 Do another (y/n)? n

Answer:

We will create program using class and objects .

Follow the following steps:

1. Create class Calculator .
2. Define three data members named operand1(int/double),operand2(int/double),operator(char)
3. Define a constructor to initialize data members.
4. Define input function to assign values to data members.(It can be used optionally)
5. Define a Function to display the result.

Program:

#include <iostream>

using namespace std;

class calculator

{

private:

int operand1,operand2,result;

char oprator;

public:

//Default Constructor

calculator()

{

operand1=0;

operand2=0;

oprator='+';

}

//Parameterised Constructor

calculator(int op1,int op2,char opr)

{

operand1=op1;

operand2=op2;

oprator=opr;

}

int doCalculation()

{

    result=0;

switch(oprator)

{

case '+':

result=operand1+operand2;

break;

case '-':

result=operand1-operand2;

break;

case '*':

result=operand1*operand2;

break;

case '/':

result=operand1/operand2;

break;

}

return result;

}

void display()

{

cout<<operand1<<" "<<oprator<<" "<<operand2<<"  =  "<<result;

}

};

int main()

{

int x=0;

int o1,o2;

char opr;

do{

cout<<"\nEnter the expression in format(operand1 oprator operand2)";

cin>>o1>>opr>>o2; 

//Object Creation

calculator c(o1,o2,opr);

//Calling the member functions

c.doCalculation();

c.display();

//To continue non-negative number is taken if -1 is entered then exit

cout<<"\nTo continue enter positive number else -1";

cin>>x;

}

while(x!=-1);

return 0;

}