array of object pointer in c++

Array of Object & Pointer to Object
Made by: Patel Arpita V.

 Array is a collection of variable of same data types.
 Similarly, array of class objects means a collection of
objects of same types.
 Hence, an array having class type element is known as
array of object.
 syntax:
Class_name object_name [size];

#include<iostream.h>
#include<conio.h>
class employee
{
int age;
char name[20], post[20];
double salary;
public:
void getdata();
void putdata();
};
void employee::getdata()
{
cout<<"Name : ";
cin>>name;
cout<<"Age : ";
cin>>age;
cout<<"Post : ";
cin>>post;
cout<<"Salary : ";
cin>>salary;
}
void employee::putdata()
{
cout<<"Name : "<<name;
cout<<"nAge : "<<age;
cout<<"nPost : "<<post;
cout<<"nSalary : "<<salary;
}
int main()
{
int i;
clrscr();
employee emp[2];
for(i=1; i<2; i++)
{
cout<<"Get details :-n";
emp[i].getdata();
}
for(i=1; i<2; i++)
{
cout<<“nEmployee"<<i<<" :-n";
emp[i].putdata();
}
getch();
return 0;
}

 What is Pointer?
-Pointer means the variable that stores the address
of another variable.

 A pointer can point to an object created by class.
 Example: abc ob;
Here abc=class and ob=object of class abc.
 we can define pointer of type abc as below:
abc *ptr;
 Object pointers are useful in creating objects at run
time.

 We can also use an object pointer to access the public
members of class.
 We can access to member function of abc in two ways:
1)by using (.) dot operator
ex:- (*ptr).show();
2)by using () arrow operator
ex:- ptrshow();

 Example of Pointer to
object:
#include<conio.h>
class abc
{
int a,b,ADD;
public:
void getdata()
{
cout<<"Enter the values:" ;
cin>>a>>b;
}
void display()
{
ADD=a+b;
cout<<"Sum="<<ADD;
}
};
int main()
{
clrscr();
abc *ob;
(*ob).getdata();
ob->display();
getch();
return 0;
}

 Example:
abc *ptr =new abc[10];
here, abc=class
ptr=pointer
new=memory management operator

 Example of array of object pointer:
#include<conio.h>
class abc
{
int code;
float price;
public:
void getdata(int a,int b)
{
code=a;
price=b;
}
void show()
{
cout<<"nCode:"<<code;
cout<<"nPrice:"<<price;
}
};
const int size=2;
int main()
{
clrscr();
abc *ptr=new abc[size];
abc *d=ptr;
int x,i;
float y;
for(i=1;i<size;i++)
{
cout<<"Input the value code & price:"<<i<<"n";
cin>>x>>y;
ptr->getdata(x,y);
ptr++;
}
for(i=1;i<size;i++)
{
cout<<"nitem:"<<i;
d->show();
d++;
}
getch();
return 0;
}

array of object pointer in c++

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