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實現效果：
Form1.cs代碼：
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;//記錄存儲計算方式
public Form1()
{
InitializeComponent();
}
private void eq_Click(object sender, EventArgs e)
{
switch (temp)
{
//加法運算
case 1:
try
{
result.Text = (num1 + double.Parse(result.Text)).ToString();
}
catch (Exception)
{
MessageBox.Show("還沒輸入數字呢", "錯誤提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
finally
{
temp = 0;
}
break;
//減法運算
case 2:
try
{
result.Text = (num1 - double.Parse(result.Text)).ToString();
}
catch (Exception)
{
MessageBox.Show("還沒輸入數字呢", "錯誤提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
finally
{
temp = 0;
}
break;
//乘法運算
case 3:
try
{
result.Text = (num1 * double.Parse(result.Text)).ToString();
}
catch (Exception)
{
MessageBox.Show("還沒輸入數字呢", "錯誤提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
finally
{
temp = 0;
}
break;
//除法運算，討論分母為零的情況
case 4:
if (double.Parse(result.Text)==0)
{
MessageBox.Show("除數不能為零", "錯誤提示", 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("還沒輸入數字呢", "錯誤提示", 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
{
//前邊有數字時，則直接在后邊加上.
result.Text = result.Text + "0";
}
}
private void one_Click(object sender, EventArgs e)
{
if (result.Text == "0")
{
result.Text = "1";
}
else
{
//前邊有數字時，則直接在后邊加上.
result.Text = result.Text + "1";
}
}
private void two_Click(object sender, EventArgs e)
{
if (result.Text == "0")
{
result.Text = "2";
}
else
{
//前邊有數字時，則直接在后邊加上.
result.Text = result.Text + "2";
}
}
private void three_Click(object sender, EventArgs e)
{
if (result.Text == "0")
{
result.Text = "3";
}
else
{
//前邊有數字時，則直接在后邊加上.
result.Text = result.Text + "3";
}
}
private void four_Click(object sender, EventArgs e)
{
if (result.Text == "0")
{
result.Text = "4";
}
else
{
//前邊有數字時，則直接在后邊加上.
result.Text = result.Text + "4";
}
}
private void five_Click(object sender, EventArgs e)
{
if (result.Text == "0")
{
result.Text = "5";
}
else
{
//前邊有數字時，則直接在后邊加上.
result.Text = result.Text + "5";
}
}
private void six_Click(object sender, EventArgs e)
{
if (result.Text == "0")
{
result.Text = "6";
}
else
{
//前邊有數字時，則直接在后邊加上.
result.Text = result.Text + "6";
}
}
private void seven_Click(object sender, EventArgs e)
{
if (result.Text == "0")
{
result.Text = "7";
}
else
{
//前邊有數字時，則直接在后邊加上.
result.Text = result.Text + "7";
}
}
private void eight_Click(object sender, EventArgs e)
{
if (result.Text == "0")
{
result.Text = "8";
}
else
{
//前邊有數字時，則直接在后邊加上.
result.Text = result.Text + "8";
}
}
private void nine_Click(object sender, EventArgs e)
{
if (result.Text == "0")
{
result.Text = "9";
}
else
{
//前邊有數字時，則直接在后邊加上.
result.Text = result.Text + "9";
}
}
private void point_Click(object sender, EventArgs e)
{
//小數點按鍵，初始為空，直接按 . 鍵則顯示為0.多少
if (result.Text == "")
{
result.Text = "0.";
}
//如果再次輸入.則返回都輸入的字符后邊并提示信息
else if (result.Text.IndexOf(".") >= 0)
{
MessageBox.Show("已經輸入小數點,無須再次輸入", "提示");
}
else
{
//前邊有數字時，則直接在后邊加上.
result.Text = result.Text + ".";
}
}
private void add_Click(object sender, EventArgs e)
{
temp = 1;
try
{
num1 = double.Parse(result.Text);
}
catch (Exception)
{
MessageBox.Show("還沒輸入數字呢", "錯誤提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
finally
{
result.Text = "";//隨后讓文本框歸空
}
}
private void mul_Click(object sender, EventArgs e)
{
temp = 3;
try
{
num1 = double.Parse(result.Text);
}
catch (Exception)
{
MessageBox.Show("還沒輸入數字呢", "錯誤提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
finally
{
result.Text = "";//隨后讓文本框歸空
}
}
private void sub_Click(object sender, EventArgs e)
{
temp = 2;
try
{
num1 = double.Parse(result.Text);
}
catch(Exception)
{
MessageBox.Show("還沒輸入數字呢", "錯誤提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
finally
{
result.Text = "";//隨后讓文本框歸空
}
}
private void Button1_Click(object sender, EventArgs e)
{
temp = 4;
try
{
num1 = double.Parse(result.Text);
}
catch (Exception)
{
MessageBox.Show("還沒輸入數字呢", "錯誤提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
finally
{
result.Text = "";//隨后讓文本框歸空
}
}
private void per_Click(object sender, EventArgs e)
{
temp = 5;
try
{
num1 = double.Parse(result.Text);
}
catch (Exception)
{
MessageBox.Show("還沒輸入數字呢", "錯誤提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
finally
{
result.Text = "";//隨后讓文本框歸空
}
}
private void opp_Click(object sender, EventArgs e)
{
//temp = 6;
try
{
result.Text = (-double.Parse(result.Text)).ToString();
}
catch (Exception)
{
MessageBox.Show("還沒輸入數字呢", "錯誤提示", 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("超出范圍，將要清空了！", "錯誤提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);
result.ResetText();
result.Font = new Font(result.Font.FontFamily, 20, result.Font.Style);
}
}
}
}
小編已經測試了代碼，大家可以跟著做一下看看，感謝大家對億速云的支持。
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