JAVA，

JAVA，

import java.util.Scanner;

public class Wee {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.println(“请输入分数：”);
double score = scanner.nextDouble();
scanner.close();

	if (score < 0 || score > 100) {
		System.out.println("输入的分数不在0-100之间，不符合要求");
	} else if (score >= 90) {
		System.out.println("A");

	} else if (score >= 80) { 
		System.out.println("B");

	} else if (score >= 60) {
		System.out.println("C");
	} else {
		System.out.println("D");

	}
}

}

import java.util.Scanner;

public class Wee{

public static void main(String[] args) {
	Scanner scan=new Scanner (System.in);
	System.out.print("请输入年： ");
	int year=scan.nextInt();
	if(year%4==0 && year%100!=0) {
		System.out.print("该年是闰年！");
	}else
		if(year%400==0) {
			System.out.print("该年是闰年！");
		}else
		{
			System.out.print("该年不是闰年！");
		}
	scan.close();
}
}