实验二

public class RunNian {
    public static void main(String[] args){
        for(int i = 1900; i<= 2000; i++){
            if((i % 4 == 0 && i % 100 !=0)||i % 400 ==0){
                System.out.println("i = " + i);
            }
        }
    }
}

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Ta {
    
    public static void main(String[] args) throws IOException{
        BufferedReader buf=new BufferedReader(new InputStreamReader(System.in));
        System.out.println("输入想要的高度：");
        String str=buf.readLine();
        int maxLength=Integer.parseInt(str);
        
        for(int m = 1; m <= maxLength; m++){
            printBlanks(maxLength - m);
            printStar(2 * m - 1);
            System.out.println();
        }
    }

    public static void printStar(int n){
        for(int i = 0; i < n; i++){
            System.out.print("*");
        }
    }
    
    public static void printBlanks(int  n){
        for(int i = 0; i < n; i++){
            System.out.print(" ");
        }
    }
}