Practice Top 30 C++ Programming Questions on Dynamic Memory Allocation

Practice Top 30 C++ Programming Questions on Dynamic Memory Allocation

Q1. Write a program to dynamically allocate memory for an integer, assign a value, and display it.

Input: Value = 10  
Output: Value: 10

Q2. Write a program to dynamically allocate memory for a float, assign a value, and display it.

Input: Value = 5.5  
Output: Value: 5.5

Q3. Write a program to dynamically allocate memory for an array of integers and initialize it.

Input: Array Size = 3, Values = [1, 2, 3]  
Output: Array: 1 2 3

Q4. Write a program to read and display elements of a dynamically allocated array.

Input: Size = 4, Values = [5, 6, 7, 8]  
Output: Array: 5 6 7 8

Q5. Write a program to calculate the sum of elements in a dynamically allocated array.

Input: Size = 3, Values = [2, 4, 6]  
Output: Sum: 12

Q6. Write a program to find the maximum value in a dynamically allocated array.

Input: Size = 5, Values = [3, 7, 1, 9, 5]  
Output: Maximum: 9

Q7. Write a program to dynamically allocate memory for a string and display it.

Input: String = "Dynamic"  
Output: String: Dynamic

Q8. Write a program to dynamically allocate and then deallocate memory for an integer.

Input: Value = 42  
Output: Memory deallocated.

Q9. Write a program to dynamically resize an array using realloc (or equivalent in C++).

Input: Initial Size = 2, Final Size = 4, Initial Values = [1, 2], New Values = [3, 4]  
Output: Resized Array: 1 2 3 4

Q10. Write a program to create and display a 2D dynamic array.

Input: 2x2 Array = [[1, 2], [3, 4]]  
Output:  

1 2  
3 4

Q11. Write a program to read and display elements of a 2D dynamic array.

Input: 2x3 Array = [[1, 2, 3], [4, 5, 6]]  
Output:  

1 2 3  
4 5 6

Q12. Write a program to calculate the transpose of a 2D dynamically allocated array.

Input:  Array = [[1, 2], [3, 4]]
Output:  

Transpose:  
1 3  
2 4

Q13. Write a program to create a dynamic array of strings and display them.

Input: Strings = ["Hello", "World"]  
Output: Strings: Hello World

Q14. Write a program to pass a dynamically allocated array to a function to calculate the average.

Input: Array = [4, 8, 12]  
Output: Average: 8

Q15. Write a program to allocate and then free memory for a dynamically allocated array.

Input: Size = 3, Values = [7, 14, 21]  
Output: Memory deallocated.

Q16. Write a program to create a dynamic array and initialize all elements to zero.

Input: Size = 4  
Output: Array: 0 0 0 0

Q17. Write a program to find the minimum value in a dynamically allocated array.

Input: Size = 4, Values = [9, 3, 5, 7]  
Output: Minimum: 3

Q18. Write a program to delete a specific element from a dynamically allocated array.

Input: Array = [2, 4, 6, 8], Element to Delete = 6  
Output: Array: 2 4 8

Q19. Write a program to dynamically allocate memory for an object of a custom class and display its data.

Input: Class: Student, Name = "Alice", Age = 20  
Output: Student: Alice, Age: 20

Q20. Write a program to create a dynamic array of objects and display their data.

Input: Objects: [Student(Name: John, Age: 18), Student(Name: Jane, Age: 19)]  
Output:  

John, 18  
Jane, 19

Q21. Write a program to create a dynamic array of pointers to integers.

Input: Values: [1, 2, 3]  
Output: 1 2 3

Q22. Write a program to double the size of a dynamic array when it is full.

Input: Initial Size = 2, Final Values = [1, 2, 3, 4]  
Output: Resized Array: 1 2 3 4

Q23. Write a program to reverse the elements of a dynamically allocated array.

Input: Array: [3, 6, 9]  
Output: Reversed Array: [9, 6, 3]

Q24. Write a program to sort a dynamically allocated array in ascending order.

Input: Array: [5, 3, 8]  
Output: Sorted Array: [3, 5, 8]

Q25. Write a program to merge two dynamically allocated arrays.

Input: Array1: [1, 3], Array2: [2, 4]  
Output: Merged Array: [1, 2, 3, 4]

Q26. Write a program to create a dynamic array of integer pointers and initialize them.

Input: Values: [4, 8]  
Output: Array: 4 8

Q27. Write a program to copy one dynamic array to another.

Input: Array: [6, 9, 12]  
Output: Copied Array: [6, 9, 12]

Q28. Write a program to resize a 2D dynamically allocated array.

Input: Initial: [[1, 2]], Final: [[1, 2], [3, 4]]  
Output:  

1 2  
3 4

Q29. Write a program to calculate the sum of diagonal elements of a 2D dynamic array.

Input: Matrix = [[1, 2], [3, 4]]  
Output: Diagonal Sum: 5

Q30. Write a program to free memory allocated for a 2D array.

Input: Array: [[1, 2], [3, 4]]  
Output: Memory deallocated.