form1.cs

Visual C#2005程序设计教程

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

namespace WindowsApplication7
{
	/// <summary>
	/// Form1 的摘要说明。
	/// </summary>
	public class Form1 : System.Windows.Forms.Form
	{
		private System.Windows.Forms.Button button1;
		private System.Windows.Forms.Label label1;
		private System.Windows.Forms.Label label2;
		private System.Windows.Forms.TextBox textBox1;
		/// <summary>
		/// 必需的设计器变量。
		/// </summary>
		private System.ComponentModel.Container components = null;

		public Form1()
		{
			//
			// Windows 窗体设计器支持所必需的
			//
			InitializeComponent();

			//
			// TODO: 在 InitializeComponent 调用后添加任何构造函数代码
			//
		}

		/// <summary>
		/// 清理所有正在使用的资源。
		/// </summary>
		protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if (components != null) 
				{
					components.Dispose();
				}
			}
			base.Dispose( disposing );
		}

		#region Windows 窗体设计器生成的代码
		/// <summary>
		/// 设计器支持所需的方法 - 不要使用代码编辑器修改
		/// 此方法的内容。
		/// </summary>
		private void InitializeComponent()
		{
            this.button1 = new System.Windows.Forms.Button();
            this.label1 = new System.Windows.Forms.Label();
            this.label2 = new System.Windows.Forms.Label();
            this.textBox1 = new System.Windows.Forms.TextBox();
            this.SuspendLayout();
            // 
            // button1
            // 
            this.button1.Font = new System.Drawing.Font("宋体", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134)));
            this.button1.Location = new System.Drawing.Point(109, 101);
            this.button1.Name = "button1";
            this.button1.Size = new System.Drawing.Size(77, 27);
            this.button1.TabIndex = 1;
            this.button1.Text = "计算";
            this.button1.Click += new System.EventHandler(this.button1_Click);
            // 
            // label1
            // 
            this.label1.AutoSize = true;
            this.label1.Font = new System.Drawing.Font("宋体", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134)));
            this.label1.Location = new System.Drawing.Point(57, 30);
            this.label1.Name = "label1";
            this.label1.Size = new System.Drawing.Size(180, 15);
            this.label1.TabIndex = 2;
            this.label1.Text = "请输入要计算的n的最大值";
            this.label1.TextAlign = System.Drawing.ContentAlignment.MiddleCenter;
            // 
            // label2
            // 
            this.label2.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
            this.label2.Font = new System.Drawing.Font("宋体", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134)));
            this.label2.Location = new System.Drawing.Point(40, 151);
            this.label2.Name = "label2";
            this.label2.Size = new System.Drawing.Size(215, 36);
            this.label2.TabIndex = 4;
            this.label2.TextAlign = System.Drawing.ContentAlignment.MiddleCenter;
            // 
            // textBox1
            // 
            this.textBox1.Font = new System.Drawing.Font("宋体", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134)));
            this.textBox1.Location = new System.Drawing.Point(80, 58);
            this.textBox1.Name = "textBox1";
            this.textBox1.Size = new System.Drawing.Size(134, 25);
            this.textBox1.TabIndex = 5;
            // 
            // Form1
            // 
            this.AutoScaleBaseSize = new System.Drawing.Size(8, 18);
            this.ClientSize = new System.Drawing.Size(295, 207);
            this.Controls.Add(this.textBox1);
            this.Controls.Add(this.label2);
            this.Controls.Add(this.label1);
            this.Controls.Add(this.button1);
            this.Name = "Form1";
            this.Text = "求阶乘的累加和";
            this.ResumeLayout(false);
            this.PerformLayout();

		}
		#endregion

		/// <summary>
		/// 应用程序的主入口点。
		/// </summary>
		[STAThread]
		static void Main() 
		{
			Application.Run(new Form1());
		}

		private void button1_Click(object sender, System.EventArgs e)
		{
	      int sum1,sum2;
			sum1=0;sum2=1;
			int n=Convert.ToInt32(textBox1.Text);  //类型转换
			for(int k=1;k<=n;k++) 
			{    sum2=1;  //每次求阶乘前应把sum2置为1
				for(int m=1;m<=k;m++)
			      sum2=sum2*m;
				  sum1=sum1+sum2;
			  }
		   label2.Text="1!+2！+...+n!"+"的值为"+sum1.ToString();
          }

		
		

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