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 farcoreleft()           Return Measure of Unused Memory in Far Heap

 #include   <alloc.h>

 unsigned long farcoreleft(void);

    farcoreleft() returns the total amount of unused memory in the far
    heap, between the highest allocated block and the end of memory,
    expressed in bytes.

       Returns:     A measure of unused memory, as described above.

   -------------------------------- Example ---------------------------------

    The following statement reports the size of available memory.

           #include <alloc.h>           /* for farcoreleft() */
           #include <stdio.h>           /* for printf */

           main()
           {
               printf("%ld bytes left",farcoreleft());
           }