C#桌面应用制作计算器进阶版02

devtools/2024/11/26 4:43:59/

基于C#桌面应用制作计算器进阶版01做出了少量改动，其主要改动为label1显示所有输入的字符和运算符；且当数字为正数数时，点击“+/-”按键数字转化为负数并为其加上括号，再次点击数字转化为正数并去掉其括号；点击“Del”按键时，若label1中等式已经含有运算符且最后一个运算符后已经输入数字，则每次点击删除最后一个运算符后所有数字，若不含有运算符或末尾字符为运算符，则每次点击删除末尾数字。

修改后运行效果

修改后全篇代码

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;namespace WindowsFormsApp计算器
{public partial class Form1 : Form{string symbol, num1, num2,Num1,Num2;double rt;public Form1(){InitializeComponent();}private void button1_Click(object sender, EventArgs e){label1.Text = null;label2.Text = null;num1=null;num2=null;symbol = null;}private void button2_Click(object sender, EventArgs e){char lastchar = label1.Text[label1.Text.Length - 1];string lastChar=lastchar.ToString();if (label1.Text.Length == 0){label1.Text = null;}else if (lastChar == "+" || lastChar == "-" || lastChar == "×" || lastChar == "÷"){string del = label1.Text;label1.Text = del.Substring(0, del.Length - 1);symbol = null;}else{string result_1 = label1.Text.Replace("(", "");//替换字符串中特定字符：string.Replace("原字符","替换后的字符")string result_2 = result_1.Replace(")", "");int k1 = label1.Text.IndexOf("(");int s1 = result_2.LastIndexOf("+");int s2 = result_2.LastIndexOf("-");int s3 = result_2.LastIndexOf("×");int s4 = result_2.LastIndexOf("÷");int[] sy = { s1, s2, s3, s4 };Array.Sort(sy);int max = sy[3];int min=sy[2];if (label2.Text.Length > 0&&max!=-1){num2 = result_2.Substring(max+1);if (k1 == -1){char lastsymbol = result_2[max];string last = lastsymbol.ToString();if (last == "+"){rt = double.Parse(label2.Text) - double.Parse(num2);label2.Text = rt.ToString();symbol = last;}else if (last == "-"){rt = double.Parse(label2.Text) + double.Parse(num2);label2.Text = rt.ToString();symbol = last;}else if (last == "×"){rt = double.Parse(label2.Text) / double.Parse(num2);label2.Text = rt.ToString();symbol = last;}else if (last == "÷"){rt = double.Parse(label2.Text) * double.Parse(num2);label2.Text = rt.ToString();symbol = last;}}else{string t=label1.Text.Substring(k1 - 1,1);if (t == "-"){rt = double.Parse(label2.Text) - double.Parse(num2);label2.Text = rt.ToString();symbol = t;}else{char lastsymbol = result_2[min];string last = lastsymbol.ToString();if (last == "+"){rt = double.Parse(label2.Text) + double.Parse(num2);label2.Text = rt.ToString();symbol = last;}else if (last == "×"){rt = double.Parse(label2.Text) / (-double.Parse(num2));label2.Text = rt.ToString();symbol = last;}else if (last == "÷"){rt = double.Parse(label2.Text) * (-double.Parse(num2));label2.Text = rt.ToString();symbol = last;}}}string del = label1.Text;int n = num2.Length;if (k1 == -1){label1.Text = del.Substring(0, del.Length - n);}else{label1.Text = del.Substring(0, del.Length - n-3);}}else{if (label1.Text.Length == 1){symbol=null;num1=null;num2=null;label2.Text = null;string del = label1.Text;label1.Text = del.Substring(0, del.Length - 1);}else{string del = label1.Text;label1.Text = del.Substring(0, del.Length - 1);result_1 = label1.Text.Replace("(", "");//替换字符串中特定字符：string.Replace("原字符","替换后的字符")result_2 = result_1.Replace(")", "");label2.Text = result_2;}}if (label1.Text.Length < 30){if (label1.Text.Length > 16){label1.Font = new Font(label1.Font.FontFamily, 13f, label1.Font.Style);}else{label1.Font = new Font(label1.Font.FontFamily, 26f, label1.Font.Style);}}}}private void button3_Click(object sender, EventArgs e){if (label1.Text.Length == 0){MessageBox.Show("error");}else if (label1.Text == "+" || label1.Text == "-" || label1.Text == "×" || label1.Text == "÷"){MessageBox.Show("error");}else{double reserve;if (symbol == null){string result_1=label1.Text.Replace("(", "");//替换字符串中特定字符：string.Replace("原字符","替换后的字符")string result_2=result_1.Replace(")","");reserve = double.Parse( result_2);reserve = -reserve;if (reserve > 0){label1.Text = reserve.ToString();}else{label1.Text="("+reserve+")";}label2.Text = reserve.ToString();}else{int r1=label1.Text.IndexOf("(");int r2=label1.Text.IndexOf(")");int s1 = label1.Text.LastIndexOf("+");int s2 = label1.Text.LastIndexOf("-");int s3 = label1.Text.LastIndexOf("×");int s4 = label1.Text.LastIndexOf("÷");int[] sy = { s1, s2, s3, s4 };Array.Sort(sy);int max = sy[3];if (r1 > 0){string result_1 = label1.Text.Replace("(", "");//替换字符串中特定字符：string.Replace("原字符","替换后的字符")string result_2 = result_1.Replace(")", "");string max1 = result_2.Substring(r1);reserve = double.Parse(max1);reserve = -reserve;label1.Text = result_2.Substring(0, max-1) + reserve;}else{string max1 = label1.Text.Substring(max + 1);reserve = double.Parse(max1);reserve = -reserve;label1.Text = label1.Text.Substring(0, max + 1) + "(" + reserve + ")";}}if (num1 != null && symbol != null){num2 = reserve.ToString();if (symbol == "+"){rt = double.Parse(num1) + double.Parse(num2);label2.Text = rt.ToString();}else if (symbol == "-"){rt = double.Parse(num1) - double.Parse(num2);label2.Text = rt.ToString();}else if (symbol == "×"){rt = double.Parse(num1) * double.Parse(num2);label2.Text = rt.ToString();}else if (symbol == "÷"){rt = double.Parse(num1) / double.Parse(num2);label2.Text = rt.ToString();}}}}private void button4_Click(object sender, EventArgs e){string divide = "÷";if (symbol == null && label1.Text.Length<1&&num1==null){MessageBox.Show("无运算数字");}else{string result_1 = label1.Text.Replace("(", "");//替换字符串中特定字符：string.Replace("原字符","替换后的字符")string result_2 = result_1.Replace(")", "");if (symbol == null){if(num1 == null){num1 = result_2;}symbol = divide;label1.Text = label1.Text+symbol;label2.Text = result_2;}else{int last = label1.Text.Length - 1;string Last=label1.Text.Substring(last);if (Last == "+" || Last == "-" || Last == "×" || Last == "÷") {symbol=divide;string del = label1.Text;label1.Text = del.Substring(0, del.Length - 1)+symbol;}else{int s1 = result_2.LastIndexOf("+");int s2 = result_2.LastIndexOf("-");int s3 = result_2.LastIndexOf("×");int s4 = result_2.LastIndexOf("÷");int[] sy = { s1, s2, s3, s4 };Array.Sort(sy);int max = sy[3];num2 = result_2.Substring(max + 1);num1 = rt.ToString();symbol = divide;label1.Text = label1.Text + symbol;label2.Text = rt.ToString();num2 = null;}}}}private void button8_Click(object sender, EventArgs e){string seven = "7";string result_1 = label1.Text.Replace("(", "");//替换字符串中特定字符：string.Replace("原字符","替换后的字符")string result_2 = result_1.Replace(")", "");if (label1.Text.Length < 30){label1.Text = label1.Text + seven;//将数字投射到屏幕上result_2 = result_2 + seven;if (label1.Text.Length > 16){label1.Font = new Font(label1.Font.FontFamily, 13f, label1.Font.Style);}else{label1.Font = new Font(label1.Font.FontFamily, 26f, label1.Font.Style);}}else{MessageBox.Show("字符长度超出范围");}if (num1 != null && symbol != null){int s1 = result_2.LastIndexOf("+");int s2 = result_2.LastIndexOf("-");int s3 = result_2.LastIndexOf("×");int s4 = result_2.LastIndexOf("÷");int[] sy = { s1, s2, s3, s4 };Array.Sort(sy);int max = sy[3];num2 = result_2.Substring(max + 1);if (symbol == "+"){rt = double.Parse(label2.Text) + double.Parse(num2);label2.Text = rt.ToString();}else if (symbol == "-"){rt = double.Parse(label2.Text) - double.Parse(num2);label2.Text = rt.ToString();}else if (symbol == "×"){rt = double.Parse(label2.Text) * double.Parse(num2);label2.Text = rt.ToString();}else if (symbol == "÷"){rt = double.Parse(label2.Text) / double.Parse(num2);label2.Text = rt.ToString();}}}private void button7_Click(object sender, EventArgs e){string eight = "8";string result_1 = label1.Text.Replace("(", "");//替换字符串中特定字符：string.Replace("原字符","替换后的字符")string result_2 = result_1.Replace(")", "");if (label1.Text.Length < 30){label1.Text = label1.Text + eight;//将数字投射到屏幕上result_2 = result_2 + eight;if (label1.Text.Length > 16){label1.Font = new Font(label1.Font.FontFamily, 13f, label1.Font.Style);}else{label1.Font = new Font(label1.Font.FontFamily, 26f, label1.Font.Style);}}else{MessageBox.Show("字符长度超出范围");}if (num1 != null && symbol != null){int s1 = result_2.LastIndexOf("+");int s2 = result_2.LastIndexOf("-");int s3 = result_2.LastIndexOf("×");int s4 = result_2.LastIndexOf("÷");int[] sy = { s1, s2, s3, s4 };Array.Sort(sy);int max = sy[3];num2 = result_2.Substring(max + 1);if (symbol == "+"){rt = double.Parse(label2.Text) + double.Parse(num2);label2.Text = rt.ToString();}else if (symbol == "-"){rt = double.Parse(label2.Text) - double.Parse(num2);label2.Text = rt.ToString();}else if (symbol == "×"){rt = double.Parse(label2.Text) * double.Parse(num2);label2.Text = rt.ToString();}else if (symbol == "÷"){rt = double.Parse(label2.Text) / double.Parse(num2);label2.Text = rt.ToString();}}}private void button6_Click(object sender, EventArgs e){string nine = "9";string result_1 = label1.Text.Replace("(", "");//替换字符串中特定字符：string.Replace("原字符","替换后的字符")string result_2 = result_1.Replace(")", "");if (label1.Text.Length < 30){label1.Text = label1.Text + nine;//将数字投射到屏幕上result_2 = result_2 + nine;if (label1.Text.Length > 16){label1.Font = new Font(label1.Font.FontFamily, 13f, label1.Font.Style);}else{label1.Font = new Font(label1.Font.FontFamily, 26f, label1.Font.Style);}}else{MessageBox.Show("字符长度超出范围");}if (num1 != null && symbol != null){int s1 = result_2.LastIndexOf("+");int s2 = result_2.LastIndexOf("-");int s3 = result_2.LastIndexOf("×");int s4 = result_2.LastIndexOf("÷");int[] sy = { s1, s2, s3, s4 };Array.Sort(sy);int max = sy[3];num2 = result_2.Substring(max + 1);if (symbol == "+"){rt = double.Parse(label2.Text) + double.Parse(num2);label2.Text = rt.ToString();}else if (symbol == "-"){rt = double.Parse(label2.Text) - double.Parse(num2);label2.Text = rt.ToString();}else if (symbol == "×"){rt = double.Parse(label2.Text) * double.Parse(num2);label2.Text = rt.ToString();}else if (symbol == "÷"){rt = double.Parse(label2.Text) / double.Parse(num2);label2.Text = rt.ToString();}}}private void button5_Click(object sender, EventArgs e){string multiply = "×";if (symbol == null && label1.Text.Length < 1 && num1 == null){MessageBox.Show("无运算数字");}else{string result_1 = label1.Text.Replace("(", "");//替换字符串中特定字符：string.Replace("原字符","替换后的字符")string result_2 = result_1.Replace(")", "");if (symbol == null){if (num1 == null){num1 = result_2;}symbol = multiply;label1.Text = label1.Text + symbol;label2.Text = result_2;}else{int last = label1.Text.Length - 1;string Last = label1.Text.Substring(last);if (Last == "+" || Last == "-" || Last == "×" || Last == "÷") {symbol = multiply;string del = label1.Text;label1.Text = del.Substring(0, del.Length - 1) + symbol;}else{int s1 = result_2.LastIndexOf("+");int s2 = result_2.LastIndexOf("-");int s3 = result_2.LastIndexOf("×");int s4 = result_2.LastIndexOf("÷");int[] sy = { s1, s2, s3, s4 };Array.Sort(sy);int max = sy[3];num2 = result_2.Substring(max + 1);num1 = rt.ToString();symbol = multiply;label1.Text = label1.Text + symbol;label2.Text = rt.ToString();num2 = null;}}}}private void button12_Click(object sender, EventArgs e){string four = "4";string result_1 = label1.Text.Replace("(", "");//替换字符串中特定字符：string.Replace("原字符","替换后的字符")string result_2 = result_1.Replace(")", "");if (label1.Text.Length < 30){label1.Text = label1.Text + four;//将数字投射到屏幕上result_2 = result_2 + four;if (label1.Text.Length > 16){label1.Font = new Font(label1.Font.FontFamily, 13f, label1.Font.Style);}else{label1.Font = new Font(label1.Font.FontFamily, 26f, label1.Font.Style);}}else{MessageBox.Show("字符长度超出范围");}if (num1 != null && symbol != null){int s1 = result_2.LastIndexOf("+");int s2 = result_2.LastIndexOf("-");int s3 = result_2.LastIndexOf("×");int s4 = result_2.LastIndexOf("÷");int[] sy = { s1, s2, s3, s4 };Array.Sort(sy);int max = sy[3];num2 = result_2.Substring(max + 1);if (symbol == "+"){rt = double.Parse(label2.Text) + double.Parse(num2);label2.Text = rt.ToString();}else if (symbol == "-"){rt = double.Parse(label2.Text) - double.Parse(num2);label2.Text = rt.ToString();}else if (symbol == "×"){rt = double.Parse(label2.Text) * double.Parse(num2);label2.Text = rt.ToString();}else if (symbol == "÷"){rt = double.Parse(label2.Text) / double.Parse(num2);label2.Text = rt.ToString();}}}private void button11_Click(object sender, EventArgs e){string five = "5";string result_1 = label1.Text.Replace("(", "");//替换字符串中特定字符：string.Replace("原字符","替换后的字符")string result_2 = result_1.Replace(")", "");if (label1.Text.Length < 30){label1.Text = label1.Text + five;//将数字投射到屏幕上result_2 = result_2 + five;if (label1.Text.Length > 16){label1.Font = new Font(label1.Font.FontFamily, 13f, label1.Font.Style);}else{label1.Font = new Font(label1.Font.FontFamily, 26f, label1.Font.Style);}}else{MessageBox.Show("字符长度超出范围");}if (num1 != null && symbol != null){int s1 = result_2.LastIndexOf("+");int s2 = result_2.LastIndexOf("-");int s3 = result_2.LastIndexOf("×");int s4 = result_2.LastIndexOf("÷");int[] sy = { s1, s2, s3, s4 };Array.Sort(sy);int max = sy[3];num2 = result_2.Substring(max + 1);if (symbol == "+"){rt = double.Parse(label2.Text) + double.Parse(num2);label2.Text = rt.ToString();}else if (symbol == "-"){rt = double.Parse(label2.Text) - double.Parse(num2);label2.Text = rt.ToString();}else if (symbol == "×"){rt = double.Parse(label2.Text) * double.Parse(num2);label2.Text = rt.ToString();}else if (symbol == "÷"){rt = double.Parse(label2.Text) / double.Parse(num2);label2.Text = rt.ToString();}}}private void button10_Click(object sender, EventArgs e){string six = "6";string result_1 = label1.Text.Replace("(", "");//替换字符串中特定字符：string.Replace("原字符","替换后的字符")string result_2 = result_1.Replace(")", "");if (label1.Text.Length < 30){label1.Text = label1.Text + six;//将数字投射到屏幕上result_2 = result_2 + six;if (label1.Text.Length > 16){label1.Font = new Font(label1.Font.FontFamily, 13f, label1.Font.Style);}else{label1.Font = new Font(label1.Font.FontFamily, 26f, label1.Font.Style);}}else{MessageBox.Show("字符长度超出范围");}if (num1 != null && symbol != null){int s1 = result_2.LastIndexOf("+");int s2 = result_2.LastIndexOf("-");int s3 = result_2.LastIndexOf("×");int s4 = result_2.LastIndexOf("÷");int[] sy = { s1, s2, s3, s4 };Array.Sort(sy);int max = sy[3];num2 = result_2.Substring(max + 1);if (symbol == "+"){rt = double.Parse(label2.Text) + double.Parse(num2);label2.Text = rt.ToString();}else if (symbol == "-"){rt = double.Parse(label2.Text) - double.Parse(num2);label2.Text = rt.ToString();}else if (symbol == "×"){rt = double.Parse(label2.Text) * double.Parse(num2);label2.Text = rt.ToString();}else if (symbol == "÷"){rt = double.Parse(label2.Text) / double.Parse(num2);label2.Text = rt.ToString();}}}private void button9_Click(object sender, EventArgs e){string subtract = "-";if (symbol == null && label1.Text.Length < 1 && num1 == null){num1 = "0";symbol = subtract;label1.Text = label1.Text + symbol;}else{string result_1 = label1.Text.Replace("(", "");//替换字符串中特定字符：string.Replace("原字符","替换后的字符")string result_2 = result_1.Replace(")", "");if (symbol == null){if (num1 == null){num1 = result_2;}symbol = subtract;label1.Text = label1.Text + symbol;label2.Text = result_2;}else{int last = label1.Text.Length - 1;string Last = label1.Text.Substring(last);if (Last == "+" || Last == "-" || Last == "×" || Last == "÷") {symbol = subtract;string del = label1.Text;label1.Text = del.Substring(0, del.Length - 1) + symbol;}else{int s1 = result_2.LastIndexOf("+");int s2 = result_2.LastIndexOf("-");int s3 = result_2.LastIndexOf("×");int s4 = result_2.LastIndexOf("÷");int[] sy = { s1, s2, s3, s4 };Array.Sort(sy);int max = sy[3];num2 = result_2.Substring(max + 1);num1 = rt.ToString();symbol = subtract;label1.Text = label1.Text + symbol;label2.Text = rt.ToString();num2 = null;}}}}private void button16_Click(object sender, EventArgs e){string one = "1";string result_1 = label1.Text.Replace("(", "");//替换字符串中特定字符：string.Replace("原字符","替换后的字符")string result_2 = result_1.Replace(")", "");if (label1.Text.Length < 30){label1.Text = label1.Text + one;//将数字投射到屏幕上result_2 = result_2 + one;if (label1.Text.Length > 16){label1.Font = new Font(label1.Font.FontFamily, 13f, label1.Font.Style);}else{label1.Font = new Font(label1.Font.FontFamily, 26f, label1.Font.Style);}}else{MessageBox.Show("字符长度超出范围");}if (num1 != null && symbol != null){int s1 = result_2.LastIndexOf("+");int s2 = result_2.LastIndexOf("-");int s3 = result_2.LastIndexOf("×");int s4 = result_2.LastIndexOf("÷");int[] sy = { s1, s2, s3, s4 };Array.Sort(sy);int max = sy[3];num2 = result_2.Substring(max + 1);if (symbol == "+"){rt = double.Parse(label2.Text) + double.Parse(num2);label2.Text = rt.ToString();}else if (symbol == "-"){rt = double.Parse(label2.Text) - double.Parse(num2);label2.Text = rt.ToString();}else if (symbol == "×"){rt = double.Parse(label2.Text) * double.Parse(num2);label2.Text = rt.ToString();}else if (symbol == "÷"){rt = double.Parse(label2.Text) / double.Parse(num2);label2.Text = rt.ToString();}}}private void button15_Click(object sender, EventArgs e){string two = "2";string result_1 = label1.Text.Replace("(", "");//替换字符串中特定字符：string.Replace("原字符","替换后的字符")string result_2 = result_1.Replace(")", "");if (label1.Text.Length < 30){label1.Text = label1.Text + two;//将数字投射到屏幕上result_2=result_2 + two;if (label1.Text.Length > 16){label1.Font = new Font(label1.Font.FontFamily, 13f, label1.Font.Style);}else{label1.Font = new Font(label1.Font.FontFamily, 26f, label1.Font.Style);}}else{MessageBox.Show("字符长度超出范围");}if (num1 != null && symbol != null){int s1 = result_2.LastIndexOf("+");int s2 = result_2.LastIndexOf("-");int s3 = result_2.LastIndexOf("×");int s4 = result_2.LastIndexOf("÷");int[] sy = { s1, s2, s3, s4 };Array.Sort(sy);int max = sy[3];num2 = result_2.Substring(max + 1);if (symbol == "+"){rt = double.Parse(label2.Text) + double.Parse(num2);label2.Text = rt.ToString();}else if (symbol == "-"){rt = double.Parse(label2.Text) - double.Parse(num2);label2.Text = rt.ToString();}else if (symbol == "×"){rt = double.Parse(label2.Text) * double.Parse(num2);label2.Text = rt.ToString();}else if (symbol == "÷"){rt = double.Parse(label2.Text) / double.Parse(num2);label2.Text = rt.ToString();}}}private void button14_Click(object sender, EventArgs e){string three = "3";string result_1 = label1.Text.Replace("(", "");//替换字符串中特定字符：string.Replace("原字符","替换后的字符")string result_2 = result_1.Replace(")", "");if (label1.Text.Length < 30){label1.Text = label1.Text + three;//将数字投射到屏幕上result_2 = result_2 + three;if (label1.Text.Length > 16){label1.Font = new Font(label1.Font.FontFamily, 13f, label1.Font.Style);}else{label1.Font = new Font(label1.Font.FontFamily, 26f, label1.Font.Style);}}else{MessageBox.Show("字符长度超出范围");}if (num1 != null && symbol != null){int s1 = result_2.LastIndexOf("+");int s2 = result_2.LastIndexOf("-");int s3 = result_2.LastIndexOf("×");int s4 = result_2.LastIndexOf("÷");int[] sy = { s1, s2, s3, s4 };Array.Sort(sy);int max = sy[3];num2 = result_2.Substring(max + 1);if (symbol == "+"){rt = double.Parse(label2.Text) + double.Parse(num2);label2.Text = rt.ToString();}else if (symbol == "-"){rt = double.Parse(label2.Text) - double.Parse(num2);label2.Text = rt.ToString();}else if (symbol == "×"){rt = double.Parse(label2.Text) * double.Parse(num2);label2.Text = rt.ToString();}else if (symbol == "÷"){rt = double.Parse(label2.Text) / double.Parse(num2);label2.Text = rt.ToString();}}}private void button13_Click(object sender, EventArgs e){string add = "+";if (symbol == null && label1.Text.Length < 1 && num1 == null){num1 = "0";symbol = add;label1.Text = label1.Text + symbol;}else{string result_1 = label1.Text.Replace("(", "");//替换字符串中特定字符：string.Replace("原字符","替换后的字符")string result_2 = result_1.Replace(")", "");if (symbol == null){if (num1 == null){num1 = result_2;}symbol = add;label1.Text = label1.Text + symbol;label2.Text = result_2;}else{int last = label1.Text.Length - 1;string Last = label1.Text.Substring(last);if (Last == "+" || Last == "-" || Last == "×" || Last == "÷") {symbol = add;string del = label1.Text;label1.Text = del.Substring(0, del.Length - 1) + symbol;}else{int s1 = result_2.LastIndexOf("+");int s2 = result_2.LastIndexOf("-");int s3 = result_2.LastIndexOf("×");int s4 = result_2.LastIndexOf("÷");int[] sy = { s1, s2, s3, s4 };Array.Sort(sy);int max = sy[3];num2 = result_2.Substring(max + 1);num1 = rt.ToString();symbol = add;label1.Text = label1.Text + symbol;label2.Text = rt.ToString();num2 = null;}}}}private void label2_Click(object sender, EventArgs e){}private void label1_Click(object sender, EventArgs e){}private void button20_Click(object sender, EventArgs e){string result_1 = label1.Text.Replace("(", "");//替换字符串中特定字符：string.Replace("原字符","替换后的字符")string result_2 = result_1.Replace(")", "");if (label1.Text.Length == 0){MessageBox.Show("error");}else if (label1.Text == "+" || label1.Text == "-" || label1.Text == "×" || label1.Text == "÷"){MessageBox.Show("error");}else{int s1 = result_2.LastIndexOf("+");int s2 = result_2.LastIndexOf("-");int s3 = result_2.LastIndexOf("×");int s4 = result_2.LastIndexOf("÷");int r1 = label1.Text.LastIndexOf("+");int r2 = label1.Text.LastIndexOf("-");int r3 = label1.Text.LastIndexOf("×");int r4 = label1.Text.LastIndexOf("÷");int k1=label1.Text.IndexOf(")");int[] sy = { s1, s2, s3, s4 };int[] ry = { r1, r2, r3, r4 };Array.Sort(sy);Array.Sort(ry);int max = sy[3];int max1 = ry[3];double reserve = double.Parse(result_2.Substring(max + 1));reserve = reserve / 100;if (k1==-1){label1.Text = label1.Text.Substring(0, max1 + 1) + reserve;}else{label1.Text = label1.Text.Substring(0, max1 + 1) + reserve+")";}if (num1 != null && symbol != null){num2 = reserve.ToString();if (symbol == "+"){rt = double.Parse(label2.Text) + double.Parse(num2);label2.Text = rt.ToString();}else if (symbol == "-"){rt = double.Parse(label2.Text) - double.Parse(num2);label2.Text = rt.ToString();}else if (symbol == "×"){rt = double.Parse(label2.Text) * double.Parse(num2);label2.Text = rt.ToString();}else if (symbol == "÷"){rt = double.Parse(label2.Text) / double.Parse(num2);label2.Text = rt.ToString();}}}}private void button19_Click(object sender, EventArgs e){string zero = "0";string result_1 = label1.Text.Replace("(", "");//替换字符串中特定字符：string.Replace("原字符","替换后的字符")string result_2 = result_1.Replace(")", "");if (label1.Text.Length < 30){label1.Text = label1.Text + zero;//将数字投射到屏幕上result_2 = result_2 + zero;if (label1.Text.Length > 16){label1.Font = new Font(label1.Font.FontFamily, 13f, label1.Font.Style);}else{label1.Font = new Font(label1.Font.FontFamily, 26f, label1.Font.Style);}}else{MessageBox.Show("字符长度超出范围");}if (num1 != null && symbol != null){int s1 = result_2.LastIndexOf("+");int s2 = result_2.LastIndexOf("-");int s3 = result_2.LastIndexOf("×");int s4 = result_2.LastIndexOf("÷");int[] sy = { s1, s2, s3, s4 };Array.Sort(sy);int max = sy[3];num2 = result_2.Substring(max + 1);if (symbol == "+"){rt = double.Parse(label2.Text) + double.Parse(num2);label2.Text = rt.ToString();}else if (symbol == "-"){rt = double.Parse(label2.Text) - double.Parse(num2);label2.Text = rt.ToString();}else if (symbol == "×"){rt = double.Parse(label2.Text) * double.Parse(num2);label2.Text = rt.ToString();}else if (symbol == "÷"){rt = double.Parse(label2.Text) / double.Parse(num2);label2.Text = rt.ToString();}}}private void button18_Click(object sender, EventArgs e){string dot = ".";int f=label1.Text.IndexOf(".");int last = label1.Text.Length - 1;string Last = label1.Text.Substring(last);if (symbol == null){if (f == -1){if (label1.Text.Length == 0){MessageBox.Show("error1");}else if (Last == "+" || Last == "-" || Last == "×" || Last == "÷"){MessageBox.Show("error2");}else{if (label1.Text.Length < 30){label1.Text = label1.Text + dot;if (label1.Text.Length > 16){label1.Font = new Font(label1.Font.FontFamily, 13f, label1.Font.Style);}else{label1.Font = new Font(label1.Font.FontFamily, 26f, label1.Font.Style);}}else{MessageBox.Show("字符长度超出范围");}}}else{MessageBox.Show("error3");}}else{int s1 = label1.Text.LastIndexOf("+");int s2 = label1.Text.LastIndexOf("-");int s3 = label1.Text.LastIndexOf("×");int s4 = label1.Text.LastIndexOf("÷");int[] sy = { s1, s2, s3, s4 };Array.Sort(sy);int max = sy[3];num2 = label1.Text.Substring(max + 1);int f2 = num2.IndexOf(".");if (f2 == -1){if (Last == "+" || Last == "-" || Last == "×" || Last == "÷"){MessageBox.Show("error4");}else{if (label1.Text.Length < 30){label1.Text = label1.Text + dot;if (label1.Text.Length > 16){label1.Font = new Font(label1.Font.FontFamily, 13f, label1.Font.Style);}else{label1.Font = new Font(label1.Font.FontFamily, 26f, label1.Font.Style);}}else{MessageBox.Show("字符长度超出范围");}}}else{MessageBox.Show("error5");}}}private void button17_Click(object sender, EventArgs e){if (symbol == null && label1.Text.Length < 1){MessageBox.Show("无运算数字");}else{if (symbol == null) {label1.Text = label1.Text;}else{label1.Text =label2.Text;label2.Text=null;}}}}
}


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