从键盘输入一个百分制分数，将其转化为等级分输出。 90以上，输出：等级为A 80-90,输出：等级为B， 70-80,输出：等级为C， 60-70，输出：等级为D， 60分以下，输出：等级为E
1、
import java.util.Scanner;
public class Test1{
public static void main(String[] args){
Scanner scan = new Scanner(System.in);
int score = scan.nextInt();
int number = score/10;
switch(number){
case 10:
case 9:System.out.println("等级为A");break;
case 8:System.out.println("等级为B");break;
case 7:System.out.println("等级为C");break;
case 6:System.out.println("等级为D");break;
default:
System.out.println("等级为E"); }
} }
2、
import java.util.Scanner;
public class Test11{
public static void main(String [] args){
/* Scanner sc=new Scanner(System.in);
System.out.print("请输入一个百分制分数：");
double a=sc.nextDouble();
if(a >= 90){
System.out.print("等级为A");}
else if(80 <= a && 90 > a){
System.out.print("等级为B");}
else if(70 <= a && a < 80){
System.out.print("等级为C");}
else if(60 <= a && a < 70){
System.out.print("等级为D");}
else if(a<60&&a>0){
System.out.print("等级为E");}
else{
System.out.print("输入错误！");} */
/* Scanner input = new java.util.Scanner(System.in);
System.out.print("请输入成绩：");
String s = input.next();
double d = Integer.parseInt(s);
if(d>=90)
System.out.println("A");
else if (d>=80)
System.out.println("B");
else if (d>=70)
System.out.println("C");
else if (d>=60)
System.out.println("D");
else
System.out.println("E"); */
Scanner sc = new Scanner(System.in);
System.out.println("请输入一个分数:");
int t = 0;
try {
t = sc.nextInt();
} catch (Exception e) {
System.out.println("分数错误！");
return;
}
System.out.println(change(t)); }
public static String change(int t) {
if (t >= 0 && t < 60) {
return "E";
} else if (t >= 60 && t < 70) {
return "D";
} else if (t >= 70 && t < 80) {
return "C";
} else if (t >= 80 && t < 90) {
return "B";
} else if (t >= 90 && t <= 100) {
return "A";
} else {
return "分数错误!";
}
}
}