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C#在Windows窗口用“*”打印三角形

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using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Windows.Forms;namespace HomeTest005{
       public partial class Form1 : Form    {
           public Form1()        {
               InitializeComponent();        }        private void button1_Click(object sender, EventArgs e)        {
               int a = Convert.ToInt32(txtIn.Text);            for (int i = 1;i <= a;i++)          {
                 for (int n= 1; n <= a - i; n++)             {
                    lblOut.Text+=Convert.ToString(" ");             }              for (int j= 1; j <= 2*i-1; j++)             {
                    lblOut.Text+=Convert.ToString("*");              }                 lblOut.Text+=Convert.ToString("\n");          }       }     }   }

运行结果：

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