1. Implement a stack using an array.
2. Implement a stack using a linked list.
3. Write a function to push an element onto the stack.
4. Write a function to pop an element from the stack.
5. Write a function to peek at the top element of the stack without removing it.
6. Write a function to check if the stack is empty.
7. Write a function to get the size of the stack.
8. Write a function to clear the stack.
9. Implement a function to reverse a string using a stack.
10. Implement a function to check for balanced parentheses using a stack.
11. Write a function to convert infix expressions to postfix expressions using a stack.
12. Write a function to evaluate postfix expressions using a stack.
13. Implement a function to check if a given string is a palindrome using a stack.
14. Write a function to sort a stack using another stack.
15. Write a function to find the minimum element in a stack in O(1) time.
16. Implement a stack that supports push, pop, top, and retrieving the minimum element in constant time.
17. Write a function to implement a stack with a fixed size.
18. Write a function to implement a dynamic stack that grows as needed.
19. Implement a function to copy elements from one stack to another.
20. Write a function to rotate elements in a stack.
21. Implement a function to merge two stacks into one.
22. Write a function to check for matching brackets in an expression using a stack.
23. Implement a function to perform a depth-first search (DFS) using a stack.
24. Write a function to generate all permutations of a string using a stack.
25. Write a function to print the elements of a stack in reverse order.
26. Implement a function to remove duplicates from a stack.
27. Write a function to find the second largest element in a stack.
28. Implement a function to check if two stacks are equal.
29. Write a function to find the largest element in a stack.
30. Implement a function to move all elements from one stack to another.
31. Write a function to implement a queue using two stacks.
32. Implement a function to print the minimum element of the stack without removing it.
33. Write a function to push multiple elements onto the stack at once.
34. Implement a function to merge multiple stacks.
35. Write a function to find the depth of a nested stack.
36. Implement a function to push elements to the stack from a file.
37. Write a function to pop elements from the stack until it is empty.
38. Implement a function to count the number of elements in a stack.
39. Write a function to check if a stack is a subset of another stack.
40. Implement a function to simulate a stack overflow.