一：上图，代码简单，思路挺好
二：代码
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace calculator
{
public partial class Frm_main : Form
{
public Frm_main()
{
InitializeComponent();
}
private void btn_0_Click(object sender, EventArgs e)
{
clickNum("0");
}
private void btn_1_Click(object sender, EventArgs e)
{
clickNum("1");
}
private void btn_2_Click(object sender, EventArgs e)
{
clickNum("2");
}
private void btn_3_Click(object sender, EventArgs e)
{
clickNum("3");
}
private void btn_4_Click(object sender, EventArgs e)
{
clickNum("4");
}
private void btn_5_Click(object sender, EventArgs e)
{
clickNum("5");
}
private void btn_6_Click(object sender, EventArgs e)
{
clickNum("6");
}
private void btn_7_Click(object sender, EventArgs e)
{
clickNum("7");
}
private void btn_8_Click(object sender, EventArgs e)
{
clickNum("8");
}
private void btn_9_Click(object sender, EventArgs e)
{
clickNum("9");
}
private List<double> valueList = new List<double>();
private bool addState = false;//加号点击状态
private bool addOne = false;//防止加号多次打开
private bool equalState = false;//等号点击状态
/// <summary>
/// 计算机点击数字
/// </summary>
/// <param name="num">点击的数字的值</param>
private void clickNum(string num)
{
if (txt_value.Text.Length < 9)//长度要小于9
{
if (addState)//打开加号开关
{
txt_value.Clear();//清空屏幕
addState = false;//关闭加号开关
}
txt_value.Text += num;//将数字叠加显示到屏幕
addOne = false;//没有按下一次加号
}
}
/// <summary>
/// 事件:按下加号
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btn_add_Click(object sender, EventArgs e)
{
if (addOne == false)//没有按下一次加号
{
valueList.Add(double.Parse(txt_value.Text.Trim()));//将数字存到泛型数组里
addOne = true;//按下一次加号
}
addState = true;//打开加号开关
equalState = true;
}
/// <summary>
/// 事件:按下等号
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btn_result_Click(object sender, EventArgs e)
{
if (addOne==false)
{
if (equalState == true)
{
valueList.Add(double.Parse(txt_value.Text.Trim()));
equalState = false;
GetValue();
lbl_num.Text = GetString();
equalState = false;
}
}
}
/// <summary>
/// 方法用于计算累加数值并输出
/// </summary>
void GetValue()
{
double P_dbl_temp = 0;//定义局部变量
foreach (double d in valueList)//遍历集合
{
P_dbl_temp += d;//计算累加结果
}
txt_value.Text = P_dbl_temp.ToString();//显示累加结果
}
/// <summary>
/// 方法用于得到数值的字符串表示
/// </summary>
/// <returns>返回字符串数值</returns>
string GetString()
{
string P_str_temp = string.Empty;//定义局部变量
for (int i = 0; i < valueList.Count; i++)//遍历集合
{
if (i != 0)//判断是否是第一个数值
{
P_str_temp += //产生字符串
"+" + valueList[i].ToString();
}
else
{
P_str_temp = //产生字符串
valueList[i].ToString();
}
}
return P_str_temp;//返回字符串
}
private void btn_clean_Click(object sender, EventArgs e)
{
valueList.Clear();//清空集合中数值
lbl_num.Text = null;//清空计算表达式
txt_value.Clear();//清空累加结果
}
}
}
