Declaration:
char *fgets(char *str,
int n, FILE *stream);
Reads a line from the specified stream and stores it into the
string pointed to by str. It stops when either (n-1)
characters are read, the newline character is read, or the
end-of-file is reached, whichever comes first. The newline
character is copied to the string. A null character is appended
to the end of the string.
On success a pointer to the string is returned. On error a
null pointer is returned. If the end-of-file occurs before any
characters have been read, the string remains unchanged.
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