C++ Dynamic Memory

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The new and delete operators are used in Dynamic Memory allocation.

The new operator

The new operator is used to create a heap memory space for the class object.

  • To find the storage for the object to be created.
  • Initialize the object
  • Return a pointer to object

Syntax:

 pointer =new data_type;

Example:

#include <iostream>
using namespace std;

class book{
	private:
    	int a=3;
    public:
    	void showdata();
};
void book::showdata()
{
	cout << "Square of " << a << " is "<< a*a;
}
int main () {
    book *b1;
    b1=new book;
    b1->showdata();
    return 0;
}
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The delete operator

The delete operator is used to destroy the variable space which has been created by using the new operator dynamically.

Syntax:

delete pointer;

Example:

#include <iostream>
using namespace std;

int main () {
	int *p,i;
    p=new int[5];
    cout << " Enter the integers " << endl;
    for(i=0; i<5 ; i++)
    {
    	cin >> p[i];
    }
	cout << "Print the integers " << endl;
    for(i=0; i<5 ; i++)
    {
    	cout << p[i] << " ";
    }
	delete []p;
	return 0; 
}
Run ›
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