Stack_Array_With_Function

#include<stdio.h>
#define STACK_MAX 1000

int ara[STACK_MAX];
int count = 0;

int isEmpty () {

    if (count == 0) return 1;
    else return 0;
}


int isFull () {
    if (count == 100000) return 1;
    else return 0;
}


int size() {
    return count;
}


void push (int num) {

    if (count < 100000) {
        ara[count] = num;
        count++;
    }
    else printf("Error! The Stack is already full.\n");
}


int pop () {

    if (!isEmpty()) return ara[--count];
    else {
        printf("Error! The Stack is empty.\n");
        return 0;
    }
}


int top () {
    if (!isEmpty()) return ara[count-1];
    else printf("Error! The Stack is empty.\n");
}

int display () {

    int i;
    if (count == 0) printf("The Stack is empty.\n");
    for (i=0; i<count; i++) printf("%d ", ara[i]);
    printf("\n");
}

void menu () {
     while (1) {
        printf("Press 1 to push.\n");
        printf("Press 2 to check if the Stack is empty.\n");
        printf("Press 3 to pop.\n");
        printf("Press 4 to show the top element.\n");
        printf("Press 5 to display the Stack.\n");
        printf("Press 6 to check if the Stack is full.\n");
        printf("Press 0 to Exit.\n");

        int n;
        scanf("%d", &n);

        if (n==0) break;

        else if (n==1) {
            printf("Enter the number: ");
            int num;
            scanf("%d", &num);
            push(num);
        }

        else if (n==2) {
            if (isEmpty()) printf("The Stack is empty.\n");
            else printf("The Stack is not empty.\n");
        }

        else if (n==3) {
            if (!isEmpty()) printf("Popped value = %d\n", pop());
            else printf("The Stack is empty.\n");
        }

        else if (n==4) {
            if (!isEmpty()) printf("The top element = %d\n", top());
            else printf("The Stack is empty.\n");
        }

        else if (n==5) display();

        else if (n==6) {
            if (isFull()) printf("The Stack is Full.\n");
            else printf("The Stack is not Full.\n");
        }

        else {
            printf("Invalid choice! Try again.\n");
        }
    }
}


int main () {
    menu();
    return 0;
}