Apple's computers and mobile phones with different platforms is it?

Wrote only Windows program, the company recently to support the Apple system, fully understand the case to ask you.
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mac

iOS

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mac supports standard c + +
Mac with xcode program is easy to write
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You can also choose QT cross-platform

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My landlord the case, ipad and iphone is the same system
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Hey, small companies do not give us the training, is to let the self.
Really depressed ah.

Thank you.