Convert C language code to Objective-C code

Hi,

I have written a large code in C language and I like to install it in iPhone as an App.

Since the Objective-C is a subset of the C language I wonder if C code can be made into Objective-C code with minimal modification. 

I am thinking someone must have done this before

My C-code is rather large and it would be big task to rewrite it in Objective-C code from scratch

I would be grateful if someone can share the experience and give me guidance how best to tackle my task: where to look for sample codes or what reference book can be useful.

Thank you in advance

 ChangChiTheGraphics

chang Chi