#include<stdio.h>
#include <math.h>
int i=0;
unsigned long long a[100];
int main()
{
  int b;
  while(scanf("%llu",&a[i])!=EOF)
  {
  i++;
 }
  for(b=i-1;b>=0;b--)
  {
          printf("%.4lf\n",sqrt((double)a[b]));
  }
return 0;
}
help please

because u used static array!