Stack

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

#define SIZE 100

int stack[SIZE];
int top = 0;

void push(int value);
int pop();

int main()
{
    push(10);
    push(18);
    printf("%d\n", pop());
    push(12);
    push(4);
    printf("%d\n", pop());
    printf("%d\n", pop());
    printf("%d\n", pop());

    return 0;
}

void push(int value)
{
    if(top == SIZE)
    {
        printf("Stack Full\n");
        exit(1);
    }
    stack[top++] = value;
}

int pop()
{
    if(top == 0)
    {
        printf("Stack Empty\n");
        exit(2);
    }
    return stack[--top];
}