实现裴波纳契数列求和

 1   protected void Button1_Click(object sender, EventArgs e)
 2     {
 3         ListBox1.Items.Clear();//清空ListBox控件
 4         int p = 0, n = 0, a = 1, b = 1;//定义变量
 5         try
 6         {
 7             p = Convert.ToInt32(TextBox1.Text);//将字符型转换成数值型
 8         }
 9         catch//出现错误
10         {
11             Response.Write("<script>alert('请输入数值型数据');</script>");
12             TextBox1.Text = "15";
13             return;
14         }
15         for (n = 1; n <= p; n++)//对输入的数值进行遍历
16         {
17             ListBox1.Items.Add(a.ToString());//输出数值
18             ListBox1.Items.Add(b.ToString());//输出数值
19             a = a + b;//获取前两个数的和
20             b = a + b;//获取前两个数的和
21         }
22     }