请大侠帮我看看这个错误怎么回事？

//price类
import java.io.*;
import java.lang.String;
public class Price {
public static void main(String args[]){
System.out.println("please enter a number(0.10-5.00):");
float a=Keyboard.getFloat();
int b=(int)(a*100);
int c=500-b;
System.out.println("找零如下：");
if(c/200!=0){
System.out.println(c/200+"张2元");
c=c-(c/200)*200;
}
if(c/100!=0){
System.out.println(c/100+"张1元");
c=c-(c/100)*100;
        }
if(c/50!=0){
    System.out.println(c/50+"张5角");
c=c-(c/50)*50;
        }
if(c/20!=0){
System.out.println(c/20+"张2角");
c=c-(c/20)*20;
        }
if(c/10!=0){
System.out.println(c/10+"张1角");
c=c-(c/10)*10;
        }
if(c/5!=0){
System.out.println(c/5+"张5分");
c=c-(c/5)*5;
        }
if(c/2!=0){
System.out.println(c/2+"张2分");
c=c-(c/2)*2;
        }
if(c!=0){
System.out.println(c+"张1分");
        }

       } 
}//keyboard类
class Keyboard{
static BufferedReader inputStream=new BufferedReader(new InputStreamReader(System.in));
public static int getInteger(){
try{
return(Integer.valueof(inputStream.readLine().trim().intValue()));/*编译时每次说这句语句找不到符号，请高手帮帮忙。*/
}
catch(Exception e){
e.printStackTrace();
return 0;
}
}
public static String getString(){
try{
return(inputStream.readLine());
}
catch(IOException e){
return"0";
}
}
public static float getFloat(){
String s="";
try{
BufferedReader in=new BufferedReader(new InputStreamReader(System.in));
s=in.readLine();
return(Float.parseFloat(s));
}
catch(IOException e){
System.out.println("输入非法！");
return (0.0f);
}
}
}