Java输入行数打印菱形

输入行数打印菱形

package com.launc.day79;

import java.util.Scanner;

public class Test21 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.print("请输入菱形行数:");
        int n=sc.nextInt();//获取要打印菱形的行数
        while (n%2==0){//判断行数是否为偶数
            System.out.print("请输入奇数:");
            n=sc.nextInt();
        }
        //打印菱形上半部分
        for (int i=1;i<=n/2+1;i++) {
            for (int j =n/2+1-i; j >0; j--) {
                System.out.print(" ");//缩进
            }
            for (int j=1;j<=2*i-1;j++){
                System.out.print("*");
            }
            System.out.println();
        }
        //打印菱形下半部分
        for (int i=n/2;i>0;i--) {
            for (int j =1; j <=n/2-i+1; j++) {
                System.out.print(" ");
            }
            for (int j=2*i-1;j>0;j--){
                System.out.print("*");
            }
            System.out.println();
        }

    }
}