以下程序有什么错误

public class Takecare{

  int a=90;

  static float b = 10.09f;

  public static void main (String args[ ]){

       float c = a + b; System.out.println ( "=" +c);

      }

}

public class Takecare
{
static int a=90;
static float b=10.98f;
public static void main (String[] args)
{

float c=b;
System.out.println("="+c);
c=a+b;
System.out.println("="+c);
}
}