课后题 5 6

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace 习题5
{
    class Program
    {
        static void Main(string[] args)
        {
             //打印方形，每行打印10个“A”，打印10行，使用循环嵌套，不允许定义内容为“AAAAAAAAAA”的变量；
            for (int i=1;i<=10;i++)
            {
                for (int b = 1; b <= 10;b ++ )
                {
                    Console.Write("A");
                }
                Console.WriteLine();
            }
             Console.ReadLine(); 

            //            打印三角形
            //*
            //**
            //***
            //****
            //*****

            //*****
            //****
            //***
            //**
            //*

            //1111*
            //111**
            //11***
            //1****
            //*****

            //*****
            // ****
            //  ***
            //   **
            //    *

            //    *
            //   ***
            //  *****
            // *******

            //    *
            //   ***
            //  *****
            // *******
            //  *****
            //   ***
            //    *

            //1
             for(int a = 1; a <= 5; a++)
            {
                for (int b = 1; b <= a; b++)
                {
                    Console.Write("★");
                }
                Console.WriteLine();
            }
            Console.ReadLine();

            ////2
            for (int c = 1; c <= 5; c++)
            {
                for (int d = 5; d >= c; d--)
                {
                    Console.Write("★");
                }
                Console.WriteLine();
            }
            Console.ReadLine();

            //3
            for (int a = 1; a <= 5; a++)
            {
                for (int k = 4; k >= a; k--)
                {
                    Console.Write("  ");
                }
                for (int b = 1; b <= a; b++)
                {
                    Console.Write("★");
                }
                Console.WriteLine();
            }
            Console.ReadLine();

            //4
            for (int a = 1; a <= 5; a++)
            {
                for (int k = 1; k < a; k++)
                {
                    Console.Write("  ");
                }
                for (int b = 5; b >= a; b--)
                {
                    Console.Write("★");
                }
                Console.WriteLine();
            }
            Console.ReadLine();

            //5
            for (int a = 1; a <= 4; a++)
            {
                for (int b = 1; b <= 4 - a; b++)
                {
                    Console.Write("  ");
                }
                for (int c = 1; c <= 2 * a - 1; c++)
                {
                    Console.Write("★");
                }
                Console.WriteLine();
            }

               // 6
                 for (int a = 1; a <= 4; a++)
            {
                for (int b = 1; b <= 4 - a; b++)
                {
                    Console.Write("  ");
                }
                for (int c = 1; c <= 2 * a - 1; c++)
                {
                    Console.Write("★");
                }
                Console.WriteLine();
            }
                 for (int p = 1; p < 4; p++)
                 {
                     for (int o = 1; o <= p; o++)
                     {
                         Console.Write("  ");
                     }
                     for (int k = 1; k <= 2 * (4 - p) - 1;k++ )
                     {
                         Console.Write("★");
                     }
                     Console.WriteLine();
                 }
                 Console.ReadLine();

        }
    }
}