Copy of snippet "stack(array)"

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#include <stdio.h>
#include <stdbool.h>

#define MAX_SIZE 100

char items[MAX_SIZE];
int top = -1;

void initialize() {
  top = -1;
}

bool isFull() {
  return top == MAX_SIZE - 1;
}

bool isEmpty() {
  return top == -1;
}

// You are using GCC
void push(char value) {
  top = top + 1;
  items[top] = value;
  printf("Pushed: %c\n", value);
}

char pop() {
  if (top == -1) {
    printf("Stack is empty. Nothing to pop.");
    return 0;
  }
  char popped = items[top];
  top = top - 1;
  printf("Popped: %c\n", popped);
  return popped;
}

void display() {
  if (top == -1) {
    printf("Stack is empty.");
  } else {
    printf("Stack elements: ");
    for (int i = top; i > -1; i--) {
      printf("%c ", items[i]);
    }
  }
  printf("\n");
}

int main() {
  initialize();
  int choice;
  char value;

  while (true) {
    scanf("%d", &choice);

    switch (choice) {
      case 1:
        scanf(" %c", &value);
        push(value);
        break;

      case 2:
        pop();
        break;

      case 3:
        display();
        break;

      case 4:
        return 0;

      default:
        printf("Invalid choice\n");
    }
  }
  return 0;
}