Imagine you are building a student grading system. You need to create a GradesManager class that manages a list of student grades.

Your task is to implement a constructor that initializes a dynamic array of grades and a single method that calculates the average grade. The destructor should release the allocated memory automatically.

1. Implement a constructor using initializer list syntax:

   • It should take size as a parameter.
   • Allocate a dynamic array of integers called grades with the given size.
   • Use a for loop with index variable i from 0 to size to initialize each grade:
     • Assign grades[i] = i + 1 as example values.

2. Implement a single method calculateAverage:

   • Create a variable sum initialized to 0.
   • Use a for loop with index variable i from 0 to size to iterate over the grades array:
     • Add grades[i] to sum in each iteration.
   • Calculate the average as sum * 1.0 / size to ensure a double result.
   • Return the average.

3. Implement a destructor:

   • Use delete[] grades to release the memory allocated for the array.
   • Print "Grades memory released." to indicate that the memory has been freed.

Example

GradesManager(5).calculateAverage() → 3.0