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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);
           }