func main() {
var haystack stack.Stack
haystack.Push("Hay")
haystack.Push(-15)
haystack.Push([]string{"Pin", "Clip", "Needle"})
haystack.Push(81.52)
fmt.Printf("The length of the stack is %d\n", haystack.Len())
item, err := haystack.Top()
if err != nil {
log.Fatalln(err)
}
fmt.Printf("Top element of the stack is %v\n", item)
fmt.Println("Items in the stack are listed below:")
for {
item, err = haystack.Pop()
if err != nil {
break
}
fmt.Println(item)
}
}
