Backspace button in Calculator

Hello,

Just out of curiosity, I attended to use the calculator on the Iphone 4.
I typed the numbers in, but one number was uncorrect.
Unfortanaly I couldn't change it or deleted the last numbers to change the number.

However it skips an important element. "The Backspace Option"

Just a quick picture of how it could look:
NEW
http://i53.tinypic.com/vs1ke0.jpg

OLD
http://i54.tinypic.com/2h87bpc.png

Same as in Landscape Et Cetera.

Maybe some of the people that have contacts or now getting an idea of to implant it. Good luck.

Message was edited by: Aho92