form1.cs

Visual C#2005程序设计教程

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace WinApp5_3循环嵌套
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void radTriangle_CheckedChanged(object sender, EventArgs e)
        {
            if (radTriangle.Checked)
            {
                lblOut.Text = "三角形：\n";
                for (int i = 1; i <= 17; i+=2)
                {
                    for (int j = 1; j < 18 -  i ; j++)
                        lblOut.Text += " ";
                    for (int k = 1; k <= i; k++)
                        lblOut.Text += "* ";
                    lblOut.Text += "\n";
                }
            }
        }

        private void radTrapezia_CheckedChanged(object sender, EventArgs e)
        {
            if (radTrapezia.Checked)
            {
                lblOut.Text = "梯形：\n\n";
                for (int i = 4; i <= 17; i += 2)
                {
                    for (int j = 1; j < 18 - i; j++)
                        lblOut.Text += " ";
                    for (int k = 1; k <= i; k++)
                        lblOut.Text += "* ";
                    lblOut.Text += "\n";
                }
            }
        }

    }
}