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I'd like to suggest new ios app - CppCode. It's the first and the only offline C/C++ IDE & Compiler on iOS!
You can code C/C++ right on your iPhone/iPad without jailbreak and without internet connection. It starts new age of coding-on-the-go!

You can find app feature list, screenshots and video on Vimeo/Youtube and even quick start at http://cppcode.info

AppStore:
https://itunes.apple.com/app/cppcode-offline-c-c++-ide/id936694712