C#学习笔记(4)

来源：互联网发布：php使用zip压缩文件夹编辑：程序博客网时间：2024/05/25 08:14
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 demo4{    public partial class Form1 : Form    {        public Form1()        {            InitializeComponent();        }        private void button1_Click(object sender, EventArgs e)        {            CGraph C = new CGraph();        //实例化CGraph            if (textBox1.Text.Trim() != "") //判断textBox1是否有输入            {                if (textBox1.Text.Trim().IndexOf('.') == 1)//所输入中不包含“.”                {                    int i1 = Convert.ToInt32(textBox1.Text.Trim());//转换为int类型                    C.calculate(i1);        //调用calculate方法计算面积                }                else  //所输入中包含“.”，则转换为double类型                {                    double d1 = Convert.ToDouble(textBox1.Text.Trim());                    C.calculate(d1);                }            }            else if (textBox2.Text.Trim() != "" && textBox3.Text.Trim() != "")            {                double d2 = Convert.ToDouble(textBox2.Text.Trim());                double d3 = Convert.ToDouble(textBox3.Text.Trim());                C.calculate(d2, d3);            }            else if (textBox4.Text.Trim() != "" && textBox5.Text.Trim() != "" && textBox6.Text.Trim() != "")            {                double d4 = Convert.ToDouble(textBox4.Text.Trim());                double d5 = Convert.ToDouble(textBox5.Text.Trim());                double d6 = Convert.ToDouble(textBox6.Text.Trim());                C.calculate(d4, d5, d6);            }            label7.Text = CGraph.result;        }        private void button2_Click_1(object sender, EventArgs e)        {            textBox1.Text = textBox2.Text = textBox3.Text = textBox4.Text = textBox5.Text = textBox6.Text = "";            label7.Text = string.Empty;        }    }    class CGraph    {        double S;               //面积        public static string result = "没有结果";//最终输出的结果        public void calculate(double r)  //计算高精度圆面积        {            S = Math.PI * r * r;            result = "高精度圆面积为：" + S.ToString();        }        public void calculate(int r)//计算低精度圆面积        {            S = 3.1416 * r * r;            result = "低精度圆面积为：" + S.ToString();        }        public void calculate(double c, double k)  //计算矩形面积        {            S = c * k;            result = "计算矩形面积:" + S.ToString();        }        public void calculate(double a1, double a2, double a3)//计算三角形面积        {            //利用海伦公式求三角形面积            double P = 0.5 * (a1 + a2 + a3);            S = Math.Sqrt(P * (P - a1) * (P - a2) * (P - a3));            result = "三角形面积:" + S.ToString();        }    }}
0 0