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Find out whether an inputted letter is capital letter or small letter or a special symbol?
Wiki User
∙ 13y ago
You compare it against the known character ranges! The following is an example to identify ASCII characters:
- First, check if it is ASCII. All ASCII characters are less than 0x80. If it is:
- Check for a printable character (range: 0x20 to 0x7E). If it is:
- 0x20: Space
- 0x30 to 0x39: Numbers
- 0x41 to 0x5A: Capital letters
- 0x61 to 0x7A: Lowercase letters
- Everything else are special symbols ($, #, !, ?, and friends).
- Everything else are control characters
- If the value is >= 0x80, then it is not ASCII. What character it represents is specified by the codepage.
Note that some codepages (most notably the Windows-1252 codepage, sometimes incorrectly called ANSI) are extensions to the ASCII standard, so the characters less than 0x80 would be the same as in ASCII.
Wiki User
∙ 13y ago
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