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Objective-C can be compiled and run on Windows, Linux, *BSD (ie. FreeBSD, OpenBSD and NetBSD), Solaris and Mac OS X.

You can run it on iOS Devices. You can't build it but must cross-compile on Mac OS X.

There are two compilers - GCC and clang/llvm. Apple's Xcode comes with clang/llvm, for the others one uses gcc.

There are three main things you need: the compiler, the runtime and the libraries.

Well thanks for helping me.

I'll send you my bill in the mail. :-D

If you're on windows, use Cocotron.

haha sure... Is there any way i could develop ios application in windows just for learning purpose without hackintosh my pc.

You'll need the iOS SDK. That can only be _installed_ on a Mac, but once installed, I understand you can copy it over to Windows.

However I've never actually tried doing so.