import java.util.*;                                   
public class InputFloat                               
{                                                     
   public static void main(String args[])             
   {                                                  
     double a,b,c;                                    
     Scanner sc=new Scanner(System.in);               
     System.out.println("从键盘输入一个浮点数");      
     a=sc.nextDouble();                               
     b=a*a;                                           
     c=a*a*a;                                         
     System.out.println("b="+b);                      
     System.out.println("c="+c);                      
    }                                                 
}                                                     
请问哪里出错?