16.ifelse句自由拓展

import java.util.*;//声明Scanner
    public class Main {//类型
           public static void main(String[]args){//入口
Scanner input = new Scanner(System.in);
System.out.println("请输入a值");
int custNo=input.nextInt();

if (custNo>1000&&custNo<2000){
    System.out.print("大于1K");
                   }else if(custNo>2000&&custNo<3000){
     System.out.println("大于2K");
    }else if (custNo>3000){
        System.out.print("大于3K");
    }else{
    System.out.print("一千以下的正整数");
    }
            }
}

 自由拓展

import java.util.*;//声明Scanner
    public class Main {//类型
           public static void main(String[]args){//入口
Scanner input = new Scanner(System.in);
System.out.println("请输入成绩");
int custNo=input.nextInt();

if (custNo>=90){
    System.out.print("大于90,优秀");
                   }else if(custNo>=80){
     System.out.println("大于80，良好");
    }else if (custNo>=60){
        System.out.print("大于60，中等");
    }else{
    System.out.print("小于60，差劲");
    }
            }
}