visual c#.NET程序设计课后习题部分答案

visual c#.NET程序设计课后习题部分答案

二、3(1).

using System;

using System.Collections.Generic;

using System.ComponentModel; using System.Data;

using System.Drawing; using System.Linq;

using System.Text;

using System.Windows.Forms;

namespace WindowsFormsApplication1

{public partial class Form1 : Form {public Form1() {

InitializeComponent(); }

private void button1_Click(object sender, EventArgs e)

{label1.Text = \该圆的面积为：\ + 3.14159265 * float.Parse(textBox1.Text) *

float.Parse(textBox1.Text) + '\\n' + '\\n' + \该圆的周长为：\ + 2 * 3.14159265 * float.Parse(textBox1.Text);

}

private void textBox1_TextChanged(object sender, EventArgs e) { }

private void Form1_Load(object sender, EventArgs e) { }

private void label1_Click(object sender, EventArgs e) { } } }

二、3（2） using System;

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

using System.Text;

namespace ConsoleApplication2

{class Program