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Typographical errors

The compiler can sometimes fail for very simple reasons, such as typographical errors, including the misuse of upper- and lower-case characters. The C language is case-sensitive. Unlike languages such as Pascal and some versions of BASIC, C distinguishes between upper- and lower-case letters, such as A and a. If a letter is typed in the wrong case in a critical place in the source code, compilation will fail. This is a potential source of errors that are difficult to find.