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 gcvt()                  Convert Double to String

 #include   <stdlib.h>                   Required for declarations only

 char       *gcvt(value,ndec,buffer);
 double     value;                       Value to be converted
 int        ndec;                        Number of significant digits stored
 char       *buffer;                     Storage location for results

    gcvt() converts the double 'value' to a character string and stores
    it in 'buffer'.  'buffer' should be large enough to store 'value'
    plus a terminating null character ('\0'), which is automatically
    appended.  gcvt() attempts to produce 'ndec' significant digits in
    FORTRAN F format or, if unsuccessful, FORTRAN E format.  Trailing
    zeros may be suppressed. There is no provision for overflow.

       Returns:     A pointer to the string of digits.  There is no error
                    return.

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

    The following example converts a double value to a string and prints
    it out.

           #include <stdlib.h>

           char buffr[30];
           int declen = 6;

           main()
           {
                gcvt(12.9842,declen,buffr);
                printf("value: %s\n",buffr);
            }