array of object pointer in c++

Sep 11, 2017Download as pptx, pdf

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The document discusses arrays of objects and pointers to objects in C++. It defines an array of objects as a collection of objects of the same type. Syntax for an array of objects is Class_name object_name[size]. It also defines a pointer to an object as a variable that stores the address of an object. A pointer can be used to access members of a class using dot (.) or arrow (->) operators. The document provides examples of an array of objects, a pointer to an object, and an array of object pointers 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;
}

Most read

 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<iostream.h>
#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<iostream.h>
#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;
}

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

2.  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];

3. #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; }

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

6.  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.

7.  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();

8.  Example of Pointer to object: #include<iostream.h> #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; }

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

11.  Example of array of object pointer: #include<iostream.h> #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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array of object pointer in c++