I want develop on Android and iPhone...
How Platform can i use?
I want develop on Android and iPhone...
How Platform can i use?
Phonegap and Titanium Appcelerator both provide platforms where you can develop for both Android and iPhone in the same application without using different languages, just using one JavaScript API.
Native iPhone apps are written in Objective-C and Android's in Java. You can use either of the JS alternatives mentioned earlier, on any platform: unix, or microsoft. Should you want to build a native iPhone app, people tend to use xcode on OSX.
An intel based Mac,
It depends on what you mean by platform. You will need at least a Mac Mini (Intel Mac) to develop for the iPhone if you're asking about hardware requirements.
Mono/C# + MonoDevelop fits the bill software wise for writing the code once and (with tweaks) getting it to work on multiple platforms. See this related response.