Is there any way i can purchase apps for the iphone without a credit card?

You can go to the Apple Store or anywhere else and get an iTunes card.
You can use the iTunes card for anything on iTunes.. which includes apps, I think

go to target or somewhere that sells itunes gift cards and buy one. Then you go to iTunes and you click on iTunes store. On the right-hand column, under the quick-links category click on redeem. and then you enter the code on the back of your itunes card. and then just make an account