My iPhone 5 won't update apps?

I had the same problem on my old iTouch 4th gen. When I go to update an app, it asks for my password so I put it in and it says installing and then stops updating and says update again. Any one else have this problem? What do I do?

Added (1). I did. Doesn't do ***. Lol

Connect your phone to iTunes.

My does the same thing! UGH! Very frustrating. I deleted the app and had to reload.

my iphone wont update my apps

But where do we put the code in at?

My phone doesnt let me update anything! What do i do?