/*Stack Operations with Array
Afif Al Mamun*/

#include <stdio.h>
#define MAX 5

int top = -1;
int arr[MAX];

void push(int val)
{
    if(top==MAX-1)
    {
        printf("Stack Overflow!\n");
        return;
    }
    top++;
    arr[top]=val;
}

void pop()
{
    if(top==-1)
    {
        printf("Stack Underflow\n");
        return;
    }
    printf("%d has been popped!\n",arr[top--]);
}

int peek()
{
    return arr[top];
}


int main()
{
    int opt=1, v, i;

    while(opt!=0)
    {
        printf("1. Push\n2. Pop\n3. Top\n4. Display\n0. Exit\n\n");
        printf("Your choice: ");

        scanf("%d",&opt);
        printf("\n");


        switch(opt)
        {
        case 1:
            printf("--Push--\n");
            printf("Enter the value: ");
            scanf("%d",&v);
            push(v);
            break;

        case 2:
            printf("--Pop--\n");
            pop();
            break;

        case 3:
            printf("--Top--\n");
            printf("%d\n",peek());
            break;

        case 4:
            printf("--Display--\n");
            for(i=top;i>=0;i--)
            {
                printf("---\n");
                printf(" %d\n",arr[i]);
            }
            printf("---\n");
            break;

        }
    }
}