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Imagine a publishing company which does marketing for book and audio cassette versions. Create a class publication that stores the title (a string) and price (type float) of publications. 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 class, allows user to enter data and displays the data members. If an exception is caught, replace all the data member values with zero values
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Object Oriented Programming Assignment 3
Imagine a publishing company which does marketing for book and audio cassette versions. Create a class publication that stores the title (a string) and price (type float) of publications. 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 class, allows user to enter data and displays the data members. If an exception is caught, replace all the data member values with zero values
Code :
#include<iostream>
#program by Narendra Dwivedi Intel 20U520
#include<string>
using namespace std;
//base class publication
class publication
{
private:
string title;
float prices;
public:
publication()
{
title="";
prices=0.0;
}
void get_data()
{
cout<<"\nEnter Title :";
cin.ignore();//clear input buffer
getline(cin,title);
cout<<"\nEnter Price : ";
cin>>prices;
}
void put_data()
{
cout<<"\n ________________________________ \n";
cout<<"\n Information : " <<endl;
cout<<"\n Title :"<<title;
cout<<"\n Price :"<<prices;
}
};
class book: public publication
{
private:
int pages;
public:
book(){
pages=0;
}
void get_data()
{
publication::get_data();
cout<<endl;
cout<<"Enter Page Count : \n";
cin>>pages;
}
void put_data()
{
publication::put_data();
try{
if(pages<0)
throw pages;}
catch(int f)
{
cout<<"\n error: pages not valid :"<<f;
pages=0;
}
cout<<"\n Pages Are :"<<pages;
}
};
class tape: public publication
{
private:
float playtime;
public:
tape()
{
playtime=0.0;
}
void get_data()
{
publication::get_data();
cout<<"Enter Play Time Of Cassette \n";
cin>>playtime;
}
void put_data()
{
publication::put_data();
try
{
if(playtime<0.0)
throw playtime;
}
catch(float r)
{
cout<<"\n Error: Invalid Playtime : "<<playtime;
playtime=0.0;
}
cout<<"\n Playtime is : "<<playtime;
}
};
int main()//main program
{
book b[10];// arrray of objects
tape t[10];
int choice=0,bookCount=0,tapeCount=0;
cout<<"-----------------------";
do
{
cout<<"\n 1. Add book ";
cout<<"\n 2. Add tape: ";
cout<<"\n 3. Display book ";
cout<<"\n 4. Display tape";
cout<<"\n 5. Exit:"<<endl;
cout<<"\n Enter Choice : ";
cin>>choice;
switch(choice)
{
case 1:
{
cout<<"\n--------------\n";
cout<<"Add Book: \n";
b[bookCount].get_data();
bookCount++;
break;
}
case 2:
{
cout<<"\n--------------\n";
cout<<"Add Tape: \n";
t[tapeCount].get_data();
tapeCount++;
break;
}
case 3:
{
cout<<"\n (books)";
for(int j=0;j<bookCount;j++)
{
b[j].put_data();
}
break;
}
case 4:
{
cout<<"\n (tape)";
for(int j=0;j<tapeCount;j++)
{
t[j].put_data();
}
break;
}
case 5:
{
cout<<"**********Program Exited
Successfully**********"<<endl;
exit(0);
}
default:
{
cout<<"\n Invalid";
}
}
}
while(choice!=5);
return 0;
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C language is one of the most popular general-purpose programming language developed by Dennis Ritchie at Bell laboratories for UNIX operating system. The initial release of C Language was in the year 1972. Most of the desktop operating systems are written in C Language.
When ever you want to perform a set of operations based on a condition if-else is used.
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You can also use if-else for nested Ifs and if-else-if ladder when multiple conditions are to be performed on a single variable.
Switch is an alternative to if-else-if ladder.
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case value1:
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For loop is used to iterate a set of statements based on a condition.
for(Initialization; Condition; Increment/decrement){
// code
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While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.
while(condition) {
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}
Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.
do {
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Array is a collection of similar data which is stored in continuous memory addresses. Array values can be fetched using index. Index starts from 0 to size-1.
data-type array-name[size];
data-type array-name[size][size];
Function is a sub-routine which contains set of statements. Usually functions are written when multiple calls are required to same set of statements which increases re-usuability and modularity.
Two types of functions are present in C
Library functions are the in-built functions which are declared in header files like printf(),scanf(),puts(),gets() etc.,
User defined functions are the ones which are written by the programmer based on the requirement.
return_type function_name(parameters);
function_name (parameters)
return_type function_name(parameters) {
//code
}