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#include <stdlib.h> char * gcvt (double value, int ndigits, char *buf) |
This function converts its argument value into a null-terminated
string of ndigits significant digits in buf. buf
should have enough space to hold at least ndigits + 7
characters. The result roughly corresponds to what is obtained by the
following snippet:
(void) sprintf(buf, "%.*g", ndigits, value); |
except that trailing zeros and trailing decimal point are suppressed.
The least-significant digit in buf is rounded.
ecvtbuf produces the string "NaN" if value is a NaN, and
"Inf" if value is an infinity.
A pointer to buf.
| ANSI/ISO C | No |
| POSIX | No |
#include <stdlib.h>
#include <stdio.h>
#include <math.h>
char vbuf[20];
/* This will print " 3.14159". */
printf ("%s", gcvt (M_PI, 5, buf));
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