C#实现简易计算器

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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