#include<stdio.h>
#include<math.h>
double a[90];
int main(void)
{
  double ch;
  long int j=0;
  while(scanf("%lf",&ch)!=EOF && j<=90)
  a[j++]=sqrt(ch);
  for(j-=1;j>=0;--j)
  printf("%.4lf\n",a[j]);
  return 0;
}

Edited by author 16.07.2007 20:18

Edited by author 16.07.2007 20:18

Edited by author 16.07.2007 20:18

1. You haven't allocate memory for array a like this:
float a[N];
2. You don't need to do this:
if(ch == ' ')
continue;
scanf() will automaticaly read only numbers.

Good luck