rewind() is an I/O function that rewinds the file position indicator to the start of the specified stream. This function clears the EOF and the error flags associated with the stream.

    void rewind ( FILE * stream );

   #include <stdio.h>
   int main() 
    {
       FILE * re= fopen ("vowels.txt","w+");
       int a,b;
       a=22;
       b=33;
       fprintf( re, "%d %d", a, b);
       rewind( re );
       fscanf( re, "%d %d", &a, &b );
       printf( "The values read are: %d and %d\n", a, b );
       fclose(re);
    }

    The values read are: 22 and 33.

In the above example the rewind() is used to read the information printed into a file by moving the pointer to start of the stream.