C++ Dynamic Memory Allocation: Creating Objects with new Operator

Last update on December 20 2024 12:22:40 (UTC/GMT +8 hours)

Write a C++ program to dynamically create an object of a class using the new operator.

Sample Solution:

C Code:

#include <iostream>  // Including the Input/Output Stream Library

class MyClass {  // Declaration of a class named MyClass
public:
  void displayMessage() {  // Public member function within the class MyClass
    std::cout << "Dynamic object!" << std::endl;  // Outputting a message
  }
};

int main() {
  // Create a dynamic object of MyClass
  MyClass * dynamicObject = new MyClass;  // Dynamically allocating memory for an object of type MyClass

  // Call the member function of the dynamic object
  dynamicObject -> displayMessage();  // Accessing the member function of the dynamically created object using the pointer to the object

  // Deallocate the dynamic object
  delete dynamicObject;  // Deallocating the memory occupied by the dynamic object

  return 0;  // Returning 0 to indicate successful execution of the program
}

Sample Output:

Dynamic object!

Explanation:

In the above exercise,

• At first we define a class called MyClass with a member function displayMessage() that simply outputs a message.
• Inside the main() function, we use the new operator to dynamically create an object of MyClass and assign its address to a pointer called dynamicObject. This dynamically created object resides in the heap memory.
• Then use the arrow operator (->) to call the displayMessage() member function of the dynamic object.
• Finally, deallocate the dynamically created object using the delete operator to free the memory occupied by the object.

Flowchart:

CPP Code Editor:

Contribute your code and comments through Disqus.

Previous C++ Exercise: Input character and string.
Next C++ Exercise: Creating an array of objects with new operator .