/* try.c */
#include <stdio.h>
#include <stdlib.h>

void foo(double);

int main(void) {

 /* The value assigned to 'd' has no *
  * effect on the warning message.   */
 double d = 0.;
 foo(d);                 
}

void foo(double d) {
 char buf[127];
 sprintf (buf, "%.*g\n", 126, d);
 printf("%s\n", buf);
}