#define _GNU_SOURCE#include <stdlib.h>#include <stdio.h>char *gcvt(double x, int n, char *b){sprintf(b, "%.*g", n, x);return b;}
#define _GNU_SOURCE#include <stdlib.h>#include <stdio.h>char *gcvt(double x, int n, char *b){sprintf(b, "%.*g", n, x);return b;}