UCS2 vs UTF. What languages can not be displayed in the UCS2 encoding?

Question

UCS2 easier to use in Visual C++, than UTF encoding. What languages I can not support in UCS2 encoding?

Answer 1

Nothing you're likely to care about or, more to the point, have fonts for. UCS2 gives you the Basic Multilingual Plane; you can find overviews of the assigned planes on the Unicode site

• 0 - Basic Multilingual Plane
• 1 - Supplementary Multilingual Plane (ancient symbols, Klingon, etc.)
• 2 - Supplementary Ideagraphic Plane (CJK unified ideographs extensions)
• 3 - Tertiary Ideographic Plane (ancient Chinese characters)
• 14 - Supplementary Special-Purpose Plane (tag characters and variations - ?)

Of course if you really have UTF-16 support then you can access all of these anyway but if you're asking if you can ignore those then, in practice, probably yes.

Answer 2

The Unicode.org website includes an index of code blocks in code order from which you can see that as of Unicode 6.0, plane 1 includes:

• Linear B Syllabary
• Linear B Ideograms
• Aegean Numbers
• Old Italic
• Gothic
• Ugaritic
• Deseret
• Shavian
• Osmanya
• Cypriot Syllabary
• Byzantine Musical Symbols
• Musical Symbols
• Tai Xuan Jing Symbols
• Mathematical Alphanumeric Symbols

and plane 2 includes:

• CJK Unified Ideographs Extension B
• CJK Compatibility Ideographs Supplement
• Tags
• Variation Selectors Supplement