Stack

#define _CRT_NO_SECURE_WARNINGS
#define _CRT_SECURE_NO_DEPRECATE
#include<stdio.h>
#define MAX 5

typedef struct
{
    int tos;
    int s[MAX];
}stack;

void push(stack *t, int ele)
{
    if (t->tos == MAX - 1)
    {
        printf("\nStack Overflow\n");
        return;
    }
    else
    {
        t->tos++;
        t->s[t->tos] = ele;
    }
}

void display(stack *t)
{
    int i;
    if (t->tos == -1)
    {
        printf("\nStack Empty\n");
        return;
    }
    else
    {
        for (i = t->tos; i >= 0; i--)
            printf("\t%d",t->s[i]);
        printf("\n");
    }
}

int pop(stack *t)
{
    int x;
    if (t->tos == -1)
    {
        printf("\nStack Underflow\n");
        return -1;
    }
    else
    {
        x = stacktop(t);
        t->tos--;
        return x;
    }
}

int stacktop(stack *t)
{
    return t->s[t->tos];
}

void main()
{
    stack s;
    s.tos = -1;
    int ch, ele;
    while (1)
    {
        printf("\nEnter your choice\n1.Push\n2.Pop\n3.Display\n4.Stack Top\n5.Exit\n\n");
        scanf("%d", &ch);
        if (ch == 5)
            break;
        switch (ch)
        {
            case 1:
                if (s.tos == MAX - 1)
                    printf("\nStack Overflow\n");
                else
                {
                    printf("\nEnter the element to be pushed\n");
                    scanf("%d", &ele);
                    push(&s, ele);
                    display(&s);

                }
                break;
            case 2:
                if (s.tos == -1)
                    printf("\nStack Underflow\n");
                else
                    printf("\nThe popped element is %d", pop(&s));
                break;
            case 3:
                display(&s);
                break;
            case 4:
                if (s.tos == -1)
                    printf("\nStack Empty");
                else
                    printf("\nElement at the top of the stack is %d", stacktop(&s));
                break;
            default:
                printf("\nInvalid Choice.");
        }

    }
}