1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
|
#define _GNU_SOURCE
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
char *fcvt(double x, int n, int *dp, int *sign)
{
char tmp[1500];
int i, lz;
if (n > 1400U) n = 1400;
sprintf(tmp, "%.*f", n, x);
i = (tmp[0] == '-');
if (tmp[i] == '0') lz = strspn(tmp+i+2, "0");
else lz = -(int)strcspn(tmp+i, ".");
if (n<=lz) {
*sign = i;
*dp = 1;
if (n>14U) n = 14;
return "000000000000000"+14-n;
}
return ecvt(x, n-lz, dp, sign);
}
|