The International Component for Unicode (ICU) library can save you from being hopelessly mired in numerous character encodings as your C/C++ application matures into internationalization and localization.
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Learn about UTF-8 encoding of UNICODE characters.
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Adding multilanguage support to your application
Multilingual Applications - Switching Languages
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In this installment of the Xamarin series, learn about Xamarin.Forms.
Many people are still using older programming languages. Think about the pros and cons.