LZZY高级语言程序设计之169页**5.17

import java.util.Scanner;

public class MQ3 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入一个在1~15之间的数");
        Byte m = sc.nextByte();
          int n = 1;
          int a = 1;
          int c = 1;
          int l = 1;
        for ( n = 1 ; n<=m ; n++){

            for(c = 1; c <= m - n;c++ )
                System.out.print(" ");    //打前面空格

            for ( l = n; l >= 1 ; l--)
                System.out.print(l);     //打前面的递增数

            for ( a = 2; a <= n; a++)
                System.out.print(a);     //打后面的递减数


            for ( c = 1; c <= m - n ; c++)
                System.out.print(" ");       //打后面空格
            System.out.println();

        }
    }
}