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You can use fprintf on a file just like you might on a console with printf. For example to keep track of game wins, losses and ties you might write

/* saves wins, losses and, ties */
void savewlt(FILE *fout, int wins, int losses, int ties)
    fprintf(fout, "Wins: %d\nTies: %d\nLosses: %d\n", wins, ties, losses);

A side note: Some systems (infamously, Windows) do not use what most programmers would call “normal” line endings. While UNIX-like systems use \n to terminate lines, Windows uses a pair of characters: \r (carriage return) and \n (line feed). This sequence is commonly called CRLF. However, whenever using C, you do not need to worry about these highly platform-dependent details. A C compiler is required to convert every instance of \n to the correct platform line ending. So a Windows compiler would convert \n to \r\n, but a UNIX compiler would keep it as-is.

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