Stack array

#include<stdio.h>
int top=-1, arr[100];

void push(int n)
{
    if(top>=100)
    {
        printf("Stack is overflown.\n");
        return;
    }
    else
        arr[++top]=n;
}

int pop()
{
    if(top==-1)
    {
        printf("Stack is empty.\n");
        return -1;
    }
    else
        arr[top--];
}

int main()
{
    int i,n,x,s;
    scanf("%d", &n);
    for(i=0; i<n; i++)
    {
        scanf("%d", &x);
        push(x);
    }
    while(n--)
    {
        printf("%d ", arr[top]);
        pop();
    }
}