新手学java遇到的问题，请大虾帮忙！~

Question

import java.io.*;
public class Average {    public static void main(String[] args) throws IOException {
        int counter,grade,total,average;
        total=0;counter=1;
        while(counter<=10)
        {
            System.out.print("Enter letter grade:");
            System.out.flush();
            grade=System.in.read();
            
            if(grade=='A')
                total=total+4;
            else if(grade=='B')
                total=total+3;
            else if(grade=='C')
                total=total+2;
            else if(grade=='D')
                total=total+1;
            else if(grade=='F')
                total=total+0;
                System.in.skip(1);
                counter=counter+1;
        }
         average=total/10;
         System.out.println("" Class average is"" + average );
        
    }
}
编译后提示最后的 System.out.println("" Class average is"" + average );  输出行问题：‘）’ expected   
什么原因？这样用不行吗？ 应该怎么改呢？大虾详细解答解答小弟感激不尽啊！~~ 

Answer 1

改成System.out.println(" Class average is" + average ); 

Answer 2

你要是想输出引号的话就这么写：import java.io.*;
public class Average {    public static void main(String[] args) throws IOException {
        int counter,grade,total,average;
        total=0;counter=1;
        while(counter <=10)
        {
            System.out.print("Enter letter grade:");
            System.out.flush();
            grade=System.in.read();
           
            if(grade=='A')
                total=total+4;
            else if(grade=='B')
                total=total+3;
            else if(grade=='C')
                total=total+2;
            else if(grade=='D')
                total=total+1;
            else if(grade=='F')
                total=total+0;
                System.in.skip(1);
                counter=counter+1;
        }
        average=total/10;
        System.out.println("\" Class average is\"" + average );
       
    }
} 
要是不想就这样写：import java.io.*;
public class Average {    public static void main(String[] args) throws IOException {
        int counter,grade,total,average;
        total=0;counter=1;
        while(counter <=10)
        {
            System.out.print("Enter letter grade:");
            System.out.flush();
            grade=System.in.read();
           
            if(grade=='A')
                total=total+4;
            else if(grade=='B')
                total=total+3;
            else if(grade=='C')
                total=total+2;
            else if(grade=='D')
                total=total+1;
            else if(grade=='F')
                total=total+0;
                System.in.skip(1);
                counter=counter+1;
        }
        average=total/10;
        System.out.println(" Class average is" + average );
       
    }
} 

Answer 3

按你的运行结果是这样的：
--------------------Configuration: <Default>--------------------
Enter letter grade:A
Enter letter grade:Enter letter grade:A
Enter letter grade:Enter letter grade:A
Enter letter grade:Enter letter grade:A
Enter letter grade:Enter letter grade:A
Enter letter grade: Class average is2Process completed.
但是我想要的应该是：
--------------------Configuration: <Default>--------------------
Enter letter grade:A
Enter letter grade:A
Enter letter grade:A
Enter letter grade:A
Enter letter grade:A
Enter letter grade:A
Enter letter grade:A
Enter letter grade:A
Enter letter grade:A
Enter letter grade:A
Class average is2Process completed.请解答下为什么？

Answer 4

package com.vnet.flyed.basic;import java.io.IOException;
/**
 * 
 * @author flyed2008
 *
 */
public class Average {
public static void main(String[] args) throws IOException {
int counter, grade, total, average;
total = 0;
counter = 1;
while (counter <= 10) {
System.out.print("Enter letter grade:");
System.out.flush();
grade = System.in.read(); if (grade == 'A')
total = total + 4;
else if (grade == 'B')
total = total + 3;
else if (grade == 'C')
total = total + 2;
else if (grade == 'D')
total = total + 1;
else if (grade == 'F')
total = total + 0;
System.in.skip(2);
counter = counter + 1;
}
average = total / 10;
System.out.println(" Class average is:" + average); }}

Answer 5

System.in.skip(1); 
System.in.skip(2); 
这两个的区别是什么啊   为什么1的就不行

Answer 6

System.in.skip(1); 
System.in.skip(2); 
这两个的区别是什么啊   为什么1的就不行

Answer 7

skip是跳过输入流中的字节数吧，去看下API去,闪了！