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I read wikipedia but I do not understand whether extended ASCII is still just ASCII and is available on any computer that would run my console application?
Also if I understand it correctly, I can write an ASCII char only by using its unicode code in VB or C#.
Thank you
ASCII only covers the characters with value 0-127, and those are the same on all computers. (Well, almost, although this is mostly a matter of glyphs rather than semantics.)
Extended ASCII is a term for various single-byte code pages that are assign various characters to the range 128-255. There is no single “extended ASCII” set of characters.
In C# and VB.NET, all strings are Unicode, so by default, there’s no need to worry about this – whether or not a character can be displated in a console app is a matter of the fonts being used, not the limitation of any specific single-byte codepage.