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The fclose() function should be used to close the stream and its associated file after use.  For example, to write text to the file 'output.fil':

    # include  <stdio.h>
                .
                .
        FILE   *fp;                 /* declare pointer to a FILE type */
        fp = fopen("output.fil","w");       /* creates new file if non-existant */
        if (fp != NULL)
        {   fprintf(fp,"Here's some output: %d\n",99);
            fclose(fp);
        }

Note that fopen() returns the NULL pointer (defined in stdio.h) if it is unable to open the stream.

There are many other useful standard I/O functions available for binary I/O, non-sequential access, etc.

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