Dynamic Memory Allocation

Dynamic memory allocation in C++ allows you to allocate memory dynamically at runtime. It is useful when you don't know the amount of memory you will need beforehand or when you need to allocate memory in the heap.

To dynamically allocate memory in C++, you can use the new operator.

example:

int* number = new int;  // Allocates memory for a single int
*number = 42;  // Assigns a value to the dynamically allocated int
delete number;  // Frees the dynamically allocated memory

In the example above, new int allocates memory for a single integer on the heap and returns a pointer to the allocated memory. The *number = 42 assigns a value of 42 to the allocated memory location. Finally, delete number frees the dynamically allocated memory to prevent memory leaks.

we can also allocate arrays dynamically using the new operator:

int size = 5;
int* numbers = new int[size];  // Allocates memory for an array of integers
numbers[0] = 10;  // Assigns a value to the dynamically allocated array
numbers[1] = 20;
// ...
delete[] numbers;  // Frees the dynamically allocated memory for the array

In this example, new int[size] allocates memory for an array of integers with the specified size. The delete[] numbers statement is used to free the memory allocated for the array.

Remember to always deallocate dynamically allocated memory using the delete operator (delete[] for arrays) to avoid memory leaks.

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