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#include <stdlib.h>
#include <stdio.h>
char *ecvt(double x, int n, int *dp, int *sign)
{
static char buf[16];
char tmp[32];
int i, j;
if (n-1U > 15) n = 15;
sprintf(tmp, "%.*e", n-1, x);
i = *sign = (tmp[0]=='-');
for (j=0; tmp[i]!='e'; j+=(tmp[i++]!='.'))
buf[j] = tmp[i];
buf[j] = 0;
*dp = atoi(tmp+i+1);
return buf;
}
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