ppt

源程序代码：

package text;
import java.util.Scanner;
class Scored{
 int scored; 
 void set(){
  Scanner sc=new Scanner(System.in);
  try{
  System.out.println("请输入0到100间的成绩");
  scored=sc.nextInt();
  }
 catch(Exception e){
         System.out.println("输入有误，成绩应该为0-100之间的实数");
         set();
         }
 }
 void show(){
  if(scored<60&&scored>=0) System.out.println("不及格");
  else if(scored>=60&&scored<70) System.out.println("及格");
  else if(scored>=70&&scored<80) System.out.println("中");
  else if(scored>=80&&scored<90) System.out.println("良");
  else if(scored>=90&&scored<100) System.out.println("优");
  else {System.out.println("输入范围不正确，请重输");
   set();
   show();
  }
  
 }
 
}
public class Sh extends Scored{
 public static void main(String Args[]){
  Scored sco=new Scored();
  
      sco.set();
   sco.show();
  
  
 }
}