Dynamic Allocation
Dynamic memory allocation involves using operators new and delete. These operators allow you to allocate memory for variables and arrays at runtime, providing greater flexibility than static memory allocation.
-
new: operator that is used to dynamically allocate memory for an object or an array of objects during runtime;
-
delete: operator that is used to deallocate memory that was previously allocated with the new operator.
Note
A pointer pointing to dynamically allocated memory is typically stored on the stack, but the memory it points to is allocated on the heap.
To create an integer variable dynamically you have to use a pointer along with the new keyword.
To free the dynamically allocated memory, you use the delete operator:
Make it a rule for yourself: when you use new to allocate memory, always use delete to free it up later.
Note
Failure to delete dynamically allocated memory can result in memory leaks, where the program retains memory that is no longer in use.
Dynamic Allocated Arrays
When allocating memory for arrays dynamically, use the new[ ] operator and when releasing memory for dynamically allocated arrays, use delete[ ].
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Imagine you are working as a teacher who needs to calculate the average grade of a group of students.
You will also work with pointers and functions that manipulate dynamically allocated arrays.
- Create a dynamically allocated array
gradesto store students' grades. - Use the
fillRandomGradesfunction to fill the array with random grades between 60 and 100. - Complete the
calculateAveragefunction so that it:- Initializes the variable
sumto 0. - Iterates through the array using a
forloop. - Adds each grade to
sum. - Returns the average grade by dividing the total
sumby the number of students.
- Initializes the variable
- Remember to release the allocated memory using
delete[]at the end of the program to avoid memory leaks.
Solution
solution.cpp
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Dynamic memory allocation involves using operators new and delete. These operators allow you to allocate memory for variables and arrays at runtime, providing greater flexibility than static memory allocation.
-
new: operator that is used to dynamically allocate memory for an object or an array of objects during runtime;
-
delete: operator that is used to deallocate memory that was previously allocated with the new operator.
Note
A pointer pointing to dynamically allocated memory is typically stored on the stack, but the memory it points to is allocated on the heap.
To create an integer variable dynamically you have to use a pointer along with the new keyword.
To free the dynamically allocated memory, you use the delete operator:
Make it a rule for yourself: when you use new to allocate memory, always use delete to free it up later.
Note
Failure to delete dynamically allocated memory can result in memory leaks, where the program retains memory that is no longer in use.
Dynamic Allocated Arrays
When allocating memory for arrays dynamically, use the new[ ] operator and when releasing memory for dynamically allocated arrays, use delete[ ].
Swipe to start coding
Imagine you are working as a teacher who needs to calculate the average grade of a group of students.
You will also work with pointers and functions that manipulate dynamically allocated arrays.
- Create a dynamically allocated array
gradesto store students' grades. - Use the
fillRandomGradesfunction to fill the array with random grades between 60 and 100. - Complete the
calculateAveragefunction so that it:- Initializes the variable
sumto 0. - Iterates through the array using a
forloop. - Adds each grade to
sum. - Returns the average grade by dividing the total
sumby the number of students.
- Initializes the variable
- Remember to release the allocated memory using
delete[]at the end of the program to avoid memory leaks.
Solution
solution.cpp
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