#include <stdio.h>
void main() {
 int stack[20], i, n, top = -1, choice;
 printf("STACK OPERATION\n\n");
 printf("Enter number of elements to be stacked in: ");
 scanf("%d", &n);
 while (1) {
 printf("\nChoose your option:\n1. Push\n2. Pop\n3. Display\n4. Exit\n");
 scanf("%d", &choice);
 switch (choice)
{
 case 1:
 if (top >= n - 1)
{
 printf("Stack Overflow!!!\n");
 }
else {
 top++;
 printf("Enter element: ");
 scanf("%d", &stack[top]);
 } break;
 case 2:
 if (top < 0) {
 printf("Stack Underflow!!!\n");
 } else {
 printf("Popped element: %d\n", stack[top]);
 top--;
 }
 break;
 case 3:
 if (top < 0) {
 printf("Stack is empty.\n");
 } else {
 printf("Elements in the stack:\n");
 for (i = 0; i <= top; i++) {
 printf("%d\n", stack[i]);
 }
 }
 break;
 case 4:
 printf("Exiting the program.\n");
 return;
 default:
 printf("Invalid choice. Please choose again.\n");
 }
 }
}