C#编写一个简易计算器，供大家参考，具体内容如下

界面

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;using System.Collections;namespace calculor{ public partial class Form1 : Form { public Form1() { InitializeComponent(); } //stack<int> nums; Stack nums = new Stack(); //stack<char> ops; Stack ops = new Stack(); //快速幂 int qmi(int a, int b) { int res = 1; while (b > 0) { if ((b & 1) == 1) res = res * a; a = a * a; b >>= 1; } return res; } //计算 void Cal() { if (nums.Count <= 1) { if(ops.Count >= 0) { ops.Pop(); } return; } double a = (double)nums.Peek(); nums.Pop(); double b = (double)nums.Peek(); nums.Pop(); char c = (char)ops.Peek(); ops.Pop(); double d = 1; if (c == '+') d = a + b; else if (c == '-') d = b - a; else if (c == '*') d = b * a; else if (c == '/') { if (a == 0) { MessageBox.Show("Invliad operator"); return; } else { d = b / a; } } else if (c == '%') d = b % a; else { d = Math.Pow(b, a); } nums.Push(d); } double Calculate(string str) { if (str[0] == '0') str = '0' + str; //-(1 + 1) string left = ""; for (int i = 0; i < str.Length; i++) left += "("; str = left + str + ")"; //保证左括号数量大于右括号 for (int i = 0; i < str.Length; i++) { if (str[i] >= '0' && str[i] <= '9') { int j = i, tmp = 0; //多位数字 bool flag = false; double t = 0; while (j < str.Length && ((str[j] >= '0' && str[j] <= '9') || str[j] == '.')) { if(str[j] == '.') { tmp = j; j++; flag = true; continue; } t = t * 10 + str[j] - '0'; j++; } i = j - 1; if (flag) { for (int l = 0; l < j - tmp - 1; l++) { t *= 0.1; } } nums.Push(t); } else { char c = str[i]; if (c == ' ') continue; if (c == '(') ops.Push(c); else if (c == '+' || c == '-') { if (c == '-' && i > 0 && !(str[i - 1] >= '0' && str[i - 1] <= '9') && str[i - 1] != ')' && str[i - 1] != ' ') //'-' 代表负号 { if (str[i + 1] == '(') // 将-(...)变成-1 * (...) { nums.Push(-1); ops.Push('*'); } else { int j = i + 1, tmp = 0; double t = 0; bool flag = false; while (j < str.Length && ((str[j] >= '0' && str[j] <= '9') || str[j] == '.')) { if (str[j] == '.') { tmp = j; j++; flag = true; continue; } t = t * 10 + str[j] - '0'; j++; } i = j - 1; if (flag) { for (int l = 0; l < j - tmp - 1; l++) { t *= 0.1; } } nums.Push(-t); } } else //将 + - 号前面的运算符优先级高的结算，加，减优先级最低。前面都可以结算 { while ((char)ops.Peek() != '(') Cal(); ops.Push(c); } } else if (c == '*' || c == '/' || c == '%') //将 * / 号前面的运算符优先级高或等于的结算 { while ((char)ops.Peek() == '*' || (char)ops.Peek() == '/' || (char)ops.Peek() == '^' || (char)ops.Peek() == '%') Cal(); ops.Push(c); } else if (c == '^') //将 '^' 号前面的运算符优先级高或等于的结算 { while ((char)ops.Peek() == '^') Cal(); ops.Push(c); } else if (c == ')') // 将整个括号结算 { while ((char)ops.Peek() != '(') Cal(); ops.Pop(); //删除'(' } //else MessageBox.Show("invalid operator!"); } } if(nums.Count != 0) return (double)nums.Peek(); return -1; } private void Form1_Load(object sender, EventArgs e) { } private void equal_Click(object sender, EventArgs e) { string str = txt_Result.Text; double res = Calculate(str); if (res == -1) { txt_Result.Text = ""; return; } txt_Result.Text = res.ToString(); } private void digitOne_Click(object sender, EventArgs e) { txt_Result.Text += digitOne.Text; } private void digitTwo_Click(object sender, EventArgs e) { txt_Result.Text += digitTwo.Text; } private void digitThree_Click(object sender, EventArgs e) { txt_Result.Text += digitThree.Text; } private void digitFour_Click(object sender, EventArgs e) { txt_Result.Text += digitFour.Text; } private void digitFive_Click(object sender, EventArgs e) { txt_Result.Text += digitFive.Text; } private void digitSix_Click(object sender, EventArgs e) { txt_Result.Text += digitSix.Text; } private void digitZero_Click(object sender, EventArgs e) { txt_Result.Text += digitZero.Text; } private void digitSeven_Click(object sender, EventArgs e) { txt_Result.Text += digitSeven.Text; } private void digitEight_Click(object sender, EventArgs e) { txt_Result.Text += digitEight.Text; } private void digitNine_Click(object sender, EventArgs e) { txt_Result.Text += digitNine.Text; } private void cal_Sqrt_Click(object sender, EventArgs e) { string str = txt_Result.Text; double res = Calculate(str); if (res == -1) { txt_Result.Text = ""; return; } if (res < 0) { MessageBox.Show("{数据不合法"); txt_Result.Text = ""; return; } double res1 = Math.Sqrt(res); txt_Result.Text = res1.ToString(); } private void Dot_Click(object sender, EventArgs e) { txt_Result.Text += Dot.Text; } private void cal_Multi_Click(object sender, EventArgs e) { txt_Result.Text += cal_Multi.Text; } private void cal_Sub_Click(object sender, EventArgs e) { txt_Result.Text += cal_Sub.Text; } private void cal_Add_Click(object sender, EventArgs e) { txt_Result.Text += cal_Add.Text; } private void cal_Rem_Click(object sender, EventArgs e) { txt_Result.Text += cal_Rem.Text; } private void left_brack_Click(object sender, EventArgs e) { txt_Result.Text += left_brack.Text; } private void right_brack_Click(object sender, EventArgs e) { txt_Result.Text += right_brack.Text; } private void cal_log_Click(object sender, EventArgs e) { string str = txt_Result.Text; double res = Calculate(str); if (res == -1) { txt_Result.Text = ""; return; } if (res < 0) { MessageBox.Show("{数据不合法"); txt_Result.Text = ""; return; } double res1 = Math.Log(res); txt_Result.Text = res1.ToString(); } private void btn_Clear_Click(object sender, EventArgs e) { txt_Result.Text = ""; } private void cal_mi_Click(object sender, EventArgs e) { txt_Result.Text += cal_mi.Text; } private void cal_Div_Click(object sender, EventArgs e) { txt_Result.Text += cal_Div.Text; } private void btn_backspace_Click(object sender, EventArgs e) { string str = txt_Result.Text; string newStr = ""; int len = str.Length; if (len > 0) { for(int i = 0; i < len - 1; i++) { newStr += str[i]; } } txt_Result.Text = newStr; } }}

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