Just bought digital camera with a 4gb memory card how many photos will i get on it?

That depends on the resolution setting that you're using (1MP, 3MP, 5MP etc). Most cameras will display the number of pictures remaining in the upper-right corner based on the current resolution setting. To give a rough idea though, you could easily store over 1000 pictures even on a higher resolution with a 4GB card.

I had a 2gb card on a 8.0 megapixel setting and I got about 850 photos out of it. Hope that helps

2 Megapixel Camera = 4551 Photos
3 Megapixel Camera = 3413 Photos
4 Megapixel Camera = 2048 Photos
5 Megapixel Camera = 1639 Photos
6 Megapixel Camera = 1280 Photos

over 1000

A lot.

Don't forget to copy off your pics to your PC regularly...you don't want to have your camera stolen with the card in it that has an entire years worth of pics on it.