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gvcvt, gcvtf
[format double or float as string]

    SYNOPSIS
    #include <stdlib.h>
    char *gcvt(double val, int precision, char *buf);
    char *gcvtf(float val, int precision, char *buf);

DESCRIPTION
gcvt writes a fully formatted number as a null-terminated string in the buffer *buf. gcvtf produces corresponding character representations of float numbers.

gcvt uses the same rules as the printf format %.precisiong—only negative values are signed (with -), and either exponential or ordinary decimal-fraction format is chosen depending on the number of significant digits (specified by precision).

RETURNS
The result is a pointer to the formatted representation of val (the same as the argument buf).

COMPLIANCE
Neither function is ANSI C.

Supporting OS subroutines required: close, fstat, isatty, lseek, read, sbrk, write.