Is it ok that I am writing a book but I haven't figured out the ending yet?

if you are really sure that you want to write it out , and will be constantly till the end, the go ahead!
when you reach to the moment, you will naturally know how the ending will be, i'm sure

Of course it is not

Of course you can write without knowing the ending. Some writers prefer to do it that way. Others prefer to have an outline. Do what feels right for your work.

yes. My gma is writing a book (W/ a little of my help) and she doesn't know the ending, we don't even have the first chapter, all she has is the prologue! lol

Well, figure out your plot first. Develope the story around the plot. When you feel the time is right figure out the ending.

Tottaly as long as it follows a story line and doesn't have any big plot holes. Plz answer my Q the only thing that can cheer me up is Adele I love him!!!!