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class Book
{
friend void CompPrice(Book &,Book&); //friend function that has access to the member functions of this class
//The arguments sent to it are by address, and of type the class Book, so that it can have access to its member functions
private: //private data members
char *BookName; //creating a pointer to use for the dynamic array
const char Category; //const data member
int Pages;
int Pub_Date;
double Price;
Shelfmark Var; //Shelfmark data member in class Book (composition)
static double VAT; //static data member VAT cant be initialized inside the constructor nor inside the class
public:
Book():Category('S') //Default constructor
{ //Category defaulted in same line as definition because its a const data member
BookName=NULL; //BookName is an empty string
Pages=20; //Default values
Pub_Date=1998;
Price=2;
Var.setNum2(0); //set functions used to access the private data members of class Shelfmark to initialise them to 0
Var.setNum1(0);
}
Book(char *Array,int N,int P,double K, int D,int C, int O, int Q):Category((C=='R' || C=='A' || C=='S')?C:'S')
//Overloaded constructor that takes arguments. Category's conditions are in the same line as the consturctor definition
{
setBookName(Array,N); //setBookName function takes a pointer as an arguemnt along with an integer
setPages(P); //setPages function takes an int as an argument
setPub_Date(D); //setPub_Date function that takes an int as an argument
setPrice(K); //setPrice function that takes a double value as an argument
setVar1(O); //setVar1 function takes int as an argument
setVar2(Q); //setVar2 function takes int as an argument
}
Book &setBookName (char *Array, int N) //return type is Book & (used for cascading capacity)
{
{
if (Array) //If an array is passed, enter the if scope
{
BookName= new char[strlen(Array)+1]; //Creating an array of har dynamically
assert(BookName!=0); //using assert to make sure we have enough space in memory to create the new array
strcpy(BookName,Array); //copying the char in Array to Bookname
BookName[strlen(Array)]='\0'; //placing the null terminator in the end
}
else BookName=NULL; //If an array isnt passed, Bookname will point to an empty string
}
return *this; //returning *this for Cascading capacity
}
Book & setPages (int P) //return type is Book & for cascading capacity
{
Pages=(P>0?P:20); //Checking for P's validity using the ?: terminator
return *this; //return *this for cascading capacity. (*this pointer to the variable that called the function)
}
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