实现效果：
Form1.cs代码：
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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 Cal{ public partial class Form1 : Form { public double num1; public int temp = 0;//记录存储计算方式 public Form1() { InitializeComponent(); } private void eq_Click(object sender, EventArgs e) { switch (temp) { //加法运算 case 1: try { result.Text = (num1 + double.Parse(result.Text)).ToString(); } catch (Exception) { MessageBox.Show("还没输入数字呢", "错误提示", MessageBoxButtons.OK, MessageBoxIcon.Warning); } finally { temp = 0; } break; //减法运算 case 2: try { result.Text = (num1 - double.Parse(result.Text)).ToString(); } catch (Exception) { MessageBox.Show("还没输入数字呢", "错误提示", MessageBoxButtons.OK, MessageBoxIcon.Warning); } finally { temp = 0; } break; //乘法运算 case 3: try { result.Text = (num1 * double.Parse(result.Text)).ToString(); } catch (Exception) { MessageBox.Show("还没输入数字呢", "错误提示", MessageBoxButtons.OK, MessageBoxIcon.Warning); } finally { temp = 0; } break; //除法运算，讨论分母为零的情况 case 4: if (double.Parse(result.Text)==0) { MessageBox.Show("除数不能为零", "错误提示", MessageBoxButtons.OK, MessageBoxIcon.Warning); result.ResetText(); } else { result.Text = (num1 / double.Parse(result.Text)).ToString(); temp = 0; } break; case 5: try { result.Text = (num1 % double.Parse(result.Text)).ToString(); } catch (Exception) { MessageBox.Show("还没输入数字呢", "错误提示", MessageBoxButtons.OK, MessageBoxIcon.Warning); } finally { temp = 0; } break; } } private void empty_Click(object sender, EventArgs e) { result.Text = "0"; num1 = 0; temp = 0; //清除 //if (result.Text.Length > 0) //{ // result.Text = result.Text.Substring(0, result.Text.Length - 1); //} } private void Zero_Click(object sender, EventArgs e) { if (result.Text == "0") { result.Text = "0"; } else { //前边有数字时，则直接在后边加上. result.Text = result.Text + "0"; } } private void one_Click(object sender, EventArgs e) { if (result.Text == "0") { result.Text = "1"; } else { //前边有数字时，则直接在后边加上. result.Text = result.Text + "1"; } } private void two_Click(object sender, EventArgs e) { if (result.Text == "0") { result.Text = "2"; } else { //前边有数字时，则直接在后边加上. result.Text = result.Text + "2"; } } private void three_Click(object sender, EventArgs e) { if (result.Text == "0") { result.Text = "3"; } else { //前边有数字时，则直接在后边加上. result.Text = result.Text + "3"; } } private void four_Click(object sender, EventArgs e) { if (result.Text == "0") { result.Text = "4"; } else { //前边有数字时，则直接在后边加上. result.Text = result.Text + "4"; } } private void five_Click(object sender, EventArgs e) { if (result.Text == "0") { result.Text = "5"; } else { //前边有数字时，则直接在后边加上. result.Text = result.Text + "5"; } } private void six_Click(object sender, EventArgs e) { if (result.Text == "0") { result.Text = "6"; } else { //前边有数字时，则直接在后边加上. result.Text = result.Text + "6"; } } private void seven_Click(object sender, EventArgs e) { if (result.Text == "0") { result.Text = "7"; } else { //前边有数字时，则直接在后边加上. result.Text = result.Text + "7"; } } private void eight_Click(object sender, EventArgs e) { if (result.Text == "0") { result.Text = "8"; } else { //前边有数字时，则直接在后边加上. result.Text = result.Text + "8"; } } private void nine_Click(object sender, EventArgs e) { if (result.Text == "0") { result.Text = "9"; } else { //前边有数字时，则直接在后边加上. result.Text = result.Text + "9"; } } private void point_Click(object sender, EventArgs e) { //小数点按键，初始为空，直接按 . 键则显示为0.多少 if (result.Text == "") { result.Text = "0."; } //如果再次输入.则返回都输入的字符后边并提示信息 else if (result.Text.IndexOf(".") >= 0) { MessageBox.Show("已经输入小数点,无须再次输入", "提示"); } else { //前边有数字时，则直接在后边加上. result.Text = result.Text + "."; } } private void add_Click(object sender, EventArgs e) { temp = 1; try { num1 = double.Parse(result.Text); } catch (Exception) { MessageBox.Show("还没输入数字呢", "错误提示", MessageBoxButtons.OK, MessageBoxIcon.Warning); } finally { result.Text = "";//随后让文本框归空 } } private void mul_Click(object sender, EventArgs e) { temp = 3; try { num1 = double.Parse(result.Text); } catch (Exception) { MessageBox.Show("还没输入数字呢", "错误提示", MessageBoxButtons.OK, MessageBoxIcon.Warning); } finally { result.Text = "";//随后让文本框归空 } } private void sub_Click(object sender, EventArgs e) { temp = 2; try { num1 = double.Parse(result.Text); } catch(Exception) { MessageBox.Show("还没输入数字呢", "错误提示", MessageBoxButtons.OK, MessageBoxIcon.Warning); } finally { result.Text = "";//随后让文本框归空 } } private void Button1_Click(object sender, EventArgs e) { temp = 4; try { num1 = double.Parse(result.Text); } catch (Exception) { MessageBox.Show("还没输入数字呢", "错误提示", MessageBoxButtons.OK, MessageBoxIcon.Warning); } finally { result.Text = "";//随后让文本框归空 } } private void per_Click(object sender, EventArgs e) { temp = 5; try { num1 = double.Parse(result.Text); } catch (Exception) { MessageBox.Show("还没输入数字呢", "错误提示", MessageBoxButtons.OK, MessageBoxIcon.Warning); } finally { result.Text = "";//随后让文本框归空 } } private void opp_Click(object sender, EventArgs e) { //temp = 6; try { result.Text = (-double.Parse(result.Text)).ToString(); } catch (Exception) { MessageBox.Show("还没输入数字呢", "错误提示", MessageBoxButtons.OK, MessageBoxIcon.Warning); } finally { temp = 0; } } private void Form1_Load(object sender, EventArgs e) { result.Text = "0"; } private void result_TextChanged(object sender, EventArgs e) { if (result.Text.Length > 18&& result.Text.Length<36) { result.Font = new Font(result.Font.FontFamily, 15, result.Font.Style); } if (result.Text.Length > 36&&result.Text.Length<45) { result.Font = new Font(result.Font.FontFamily, 10, result.Font.Style); } if (result.Text.Length > 45) { MessageBox.Show("超出范围，将要清空了！", "错误提示", MessageBoxButtons.OK, MessageBoxIcon.Warning); result.ResetText(); result.Font = new Font(result.Font.FontFamily, 20, result.Font.Style); } } }} |
小编已经测试了代码，大家可以跟着做一下看看，感谢大家对服务器之家的支持。
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