stack.c

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

#define N_ITEMS 10

/* Uncomment this section to use linked lists
typedef struct node
{
    int val;
    struct node *next;
}

// the linked list
node *head;

*/

/* Uncomment this section to use an array
#define ARRAY_LENGTH 20
int array[ARRAY_LENGTH] = {};
*/

// pushes a value onto the stack. Returns true if successful, otherwise false.
bool push(int val)
{
    (void)val;
    return false;
}

// pops a value off of the stack and returns it.
// The stack must have a value to pop.
int pop(void)
{
    return -1;
}

int main(void)
{
    // push numbers 1-10 onto the stack
    for (int i = 0; i < N_ITEMS; i++)
    {
        if (!push(i))
        {
            printf("Could not push %d\n", i);
            return 1;
        }
    }

    // pop the numbers off the stack and print them
    for (int i = 0; i < N_ITEMS; i++)
    {
        printf("%d\n", pop());
    }
}