Java笔记_打印三角形

打印三角形

package com.mike.struct;

import java.util.Scanner;

public class TestDemo {
    public static void main(String[] args) {
        //打印三角形5行

        System.out.println("输入需要打印三角形的层数：");
        Scanner scanner = new Scanner(System.in);
        int height = scanner.nextInt();

        //四个for循环
        for(int i=1;i<=height;i++){
            for(int j=height;j>=i;j--){
                System.out.print(" ");
            }
            for(int j=1;j<=i;j++){
                System. out. print("*");
            }
            for(int j=1;j<i;j++){
                System. out. print("*");
            }
            System.out.println();
        }


        //用三个for循环
        System.out.println("=================================");
        for(int i = 1;i < height+1;i++) {
            for(int j = 1;j <= height-i;j++) {
                System.out.print(" ");
            }
            for(int j = 1;j <= 2*i-1;j++) {
                System.out.print("*");
            }
            System.out.println();
        }
        scanner.close();
    }
}