Transferring data from one sheet to another

Hi all,

I wanted to : when i write data on one cell (sheet A), i want to see the same i wrote into another cell (sheet B), thts very simple, i know, but when its in blank (Sheet A), in sheet B appears a zero.
I dont want to have zero, i want to remain blank as in sheet A.

i did in sheet B "='sheet A'!A117".

i am a noob in VBA, just beginning, and i am loving....