C++ Dynamic Memory Allocation: Integer, character, string assignment

C++ Dynamic Memory Allocation: Exercise-1 with Solution

Write a C++ program to dynamically allocate an integer, a character and a string and assign a value to them.

Sample Solution:

C Code:

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

int main() {
  // Dynamically allocate an integer
  int * dynamicInt = new int;  // Allocating memory for an integer and storing its address in dynamicInt
  * dynamicInt = 20;  // Assigning a value of 20 to the dynamically allocated integer

  // Dynamically allocate a character
  char * dynamicChar = new char;  // Allocating memory for a character and storing its address in dynamicChar
  * dynamicChar = 'C';  // Assigning the character 'C' to the dynamically allocated char

  // Dynamically allocate a string
  std::string * dynamicString = new std::string;  // Allocating memory for a string and storing its address in dynamicString
  * dynamicString = "C++ Dynamically allocated string.";  // Assigning a string value to the dynamically allocated string

  // Display the values
  std::cout << "Dynamically allocated integer: " << * dynamicInt << std::endl;  // Output the dynamically allocated integer value
  std::cout << "Dynamically allocated character: " << * dynamicChar << std::endl;  // Output the dynamically allocated character
  std::cout << "Dynamically allocated string: " << * dynamicString << std::endl;  // Output the dynamically allocated string

  // Deallocate the memory
  delete dynamicInt;  // Deallocating the memory occupied by the dynamically allocated integer
  delete dynamicChar;  // Deallocating the memory occupied by the dynamically allocated character
  delete dynamicString;  // Deallocating the memory occupied by the dynamically allocated string

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

Sample Output:

Dynamically allocated integer: 20
Dynamically allocated character: C
Dynamically allocated string: C++ Dynamically allocated string.

Explanation:

In the above exercise,

• Use the new operator to dynamically allocate memory for an integer, a character, and a string. The new operator returns a pointer to the allocated memory.
• Assign values to dynamically allocated variables using the dereference operator. For example, dynamicInt = 20 assigns 20 to the dynamically allocated integer.
• Display the values of dynamically allocated variables using std::cout.
• Finally, deallocate dynamically allocated memory using the delete operator.

Flowchart:

CPP Code Editor:

Contribute your code and comments through Disqus.

Previous C++ Exercise: C++ Dynamic Memory Allocation Exercises Home.
Next C++ Exercise: Array of integers and strings initialization.