private double Counting(string input)
{
double result = 0;
MyStack <double> temp = new MyStack <double>();
for (int i = 0; i < input.Length; i++)
{
if (char.IsDigit(input[i]))
{
string a = string.Empty;
while (!IsDelimiter(input[i]) && !IsOperator(input[i]))
{
a += input[i];
i++;
if (i == input.Length)
{
break;
}
}
temp.Push(double.Parse(a));
i--;
}
else if (IsOperator(input[i]))
{
double a = temp.Pop();
double b = temp.Pop();
switch (input[i])
{
case '+': result = b + a; break;
case '-': result = b - a; break;
case '*': result = b * a; break;
case '/': result = b / a; break;
case '^':
result = double.Parse(Math.Pow(double.Parse(b.ToString()),
double.Parse(a.ToString())).ToString()); break;
}
temp.Push(result);
}
}
return(temp.Peek());
}
private string GetExpression(string input)
{
string output = string.Empty;
MyStack <char> stack = new MyStack <char>();
for (int i = 0; i < input.Length; i++)
{
if (char.IsLetter(input[i]))
{
throw new Exception("Ошибка. Недопустимые символы в выражении!");
}
if (IsDelimiter(input[i]))
{
continue;
}
if (char.IsDigit(input[i]))
{
while (!IsDelimiter(input[i]) && !IsOperator(input[i]))
{
output += input[i];
i++;
if (i == input.Length)
{
break;
}
}
output += " ";
i--;
}
if (IsOperator(input[i]))
{
if (input[i] == '(')
{
stack.Push(input[i]);
}
else if (input[i] == ')')
{
char s = stack.Pop();
while (s != '(')
{
output += s.ToString() + ' ';
s = stack.Pop();
}
}
else
{
if (stack.Count > 0)
{
if (GetPriority(input[i]) <= GetPriority(stack.Peek()))
{
output += stack.Pop().ToString() + " ";
}
}
stack.Push(char.Parse(input[i].ToString()));
}
}
}
while (stack.Count > 0)
{
output += stack.Pop() + " ";
}
return(output);
}