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gvcvt, gcvtf—format double or float as string #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. gdvtf 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).
Portability
Neither function is ANSI C.
Supporting OS subroutines required: close, fstat, isatty,
lseek, read, sbrk, write.