Making an application

How do i make an app for i-phone or android based platform i have knowledge of c++ and sdl i have a pre-made pinball game can i directly implement the code .
I am completely new to app industry , your help will be apretiated.
Is having the following criteria mandotary to make an i-phone app
To develop iOS apps, you need:

A Mac computer running OS X 10.7 (Lion) or later
Xcode
iOS SDK
Reference: https://developer.apple.com/library/ios/referencelibrary/GettingStarted/RoadMapiOS/index.html
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