键盘录入一个成绩（整数类型），判断并输出成绩的等级。

需求：键盘录入一个成绩（整数类型），判断并输出成绩的等级。

要求使用两种方式：if和switch

成绩及对应等级如下

90~100  A

80~89    B

70~79  C

60~69    D

0~59      E

If:

packagecom.briup.day5;

importjava.util.Scanner;

public class Test3{

       public static void main(String[] agrs) {

              Scanner sc = new Scanner(System.in);

              System.out.println("请输入成绩：");

              int score = sc.nextInt();

              if(90 <= score && score<= 100) {

                     System.out.println("A");

              } else if(80 <= score&& score <= 89) {

                     System.out.println("B");

              } else if(70 <= score&& score <= 79) {

                     System.out.println("C");

              } else if(60 <= score&& score <= 69){

                     System.out.println("D");

              } else if(score <= 59) {

                     System.out.println("E");

              } else {

       System.out.println("成绩录入错误")

}

       }

}

Switch:

packagecom.briup.day5;                                                    

   import java.util.Scanner;

   public class Test3 {

       public static void main(String[] args) {

           Scanner sc = new Scanner(System.in);

           System.out.println("请输入成绩：");

           int score = sc.nextInt();

           switch(score/10) {

              case 10 :

              case 9 :

                 System.out.println("A");

              break;

              case 8:

                 System.out.println("B");

              break;

              case 7:

                 System.out.println("C");

              break;

              case 6:

                 System.out.println("D");

              break;

                            case 5:

case 4:

case 3:

case 2:  

case 1:

case 0:

       System.out.println("E");

default:

                  System.out.println("成绩录入错误");

             break;

          }

      }

  }