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To read from a file, you first declare a file pointer using
FILE as the data type:
FILE* file-pointer name;
You are probably wondering why the data type, FILE, is in upper-case
characters, given that just about every other character string you have
seen is in lower-case characters. FILE is upper-case, because
FILE is really an implementation-dependent macro that defines a
structure. As you have learned, most C programmers adhere to this
convention: upper-case for macros.