public double GetValue()
{
stack = new MyStack <double>();
string[] Arr = Str.Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
foreach (var item in Arr)
{
if (double.TryParse(item, out double result))
{
stack.Push(result);
}
else
{
switch (item)
{
case "+":
stack.Push(stack.Pop() + stack.Pop());
break;
case "*":
stack.Push(stack.Pop() * stack.Pop());
break;
case "-":
stack.Push(0 - stack.Pop() + stack.Pop());
break;
case "/":
stack.Push(1 / stack.Pop() * stack.Pop());
break;
default:
throw new Exception();
}
}
}
if (stack.Count == 1)
{
return(stack.Pop());
}
throw new Exception();
}
public bool Check()
{
stack = new MyStack <char>();
for (int i = 0; i < Str.Length; i++)
{
switch (Str[i])
{
case '(':
case '{':
case '[':
stack.Push(Str[i]);
break;
case ')':
if (stack.Count == 0 || stack.Pop() != '(')
{
return(false);
}
break;
case '}':
if (stack.Count == 0 || stack.Pop() != '{')
{
return(false);
}
break;
case ']':
if (stack.Count == 0 || stack.Pop() != '[')
{
return(false);
}
break;
}
}
if (stack.Count != 0)
{
return(false);
}
return(true);
}