Implementation of Stack using Pointers

To implement a stack using pointers, follow these steps:

1. Define a structure for the stack node. This structure should contain two fields: one to store the data and another to store the address of the next node in the stack.

2. Declare a pointer variable to keep track of the top of the stack. Initially, this pointer should be set to NULL, indicating an empty stack.

3. To push an element onto the stack, allocate memory for a new node using the 'malloc' function. Assign the data value to the new node and set its next pointer to the current top of the stack. Finally, update the top pointer to point to the new node.

4. To pop an element from the stack, first check if the stack is empty by verifying if the top pointer is NULL. If it is, then the stack is empty and there is nothing to pop. Otherwise, create a temporary pointer and set it to the current top of the stack. Update the top pointer to point to the next node in the stack. Finally, free the memory allocated for the temporary pointer.

5. To check if the stack is empty, simply check if the top pointer is NULL. If it is, then the stack is empty; otherwise, it is not.

6. To access the top element of the stack without removing it, check if the stack is empty. If it is not, simply return the data value stored in the top node.

By following these steps, you can successfully implement a stack using pointers.