public MachineValue Add(MachineValue value)
{
var temp = Value + value.Value;
if (temp < Min.Value || temp > Max.Value)
{
return(Invalid);
}
return(new MachineValue(temp));
}
public MachineValue Substract(MachineValue value)
{
var temp = Value - value.Value;
if (temp < Min.Value || temp > Max.Value)
{
return(Invalid);
}
return(new MachineValue(temp));
}
public static bool TryParse(string s, out MachineValue value)
{
int temp;
if (!int.TryParse(s, out temp))
{
value = Invalid;
return(false);
}
if (temp < Min.Value || temp > Max.Value)
{
value = Invalid;
return(false);
}
value = new MachineValue(temp);
return(true);
}
public static int solution(string S)
{
var stack = new Stack <MachineValue>();
var args = S.Split(new char[] { ' ' });
for (int i = 0; i < args.Length; i++)
{
MachineValue value;
if (MachineValue.TryParse(args[i], out value))
{
stack.Push(value);
continue;
}
if (value.Equals(MachineValue.Invalid))
{
return(ErrorValue);
}
switch (args[i])
{
case "DUP":
stack.Push(stack.Peek());
continue;
case "POP":
stack.Pop();
continue;
case "+":
if (stack.Count < 2)
{
return(ErrorValue);
}
var addResult = stack.Pop().Add(stack.Pop());
if (addResult.Equals(MachineValue.Invalid))
{
return(ErrorValue);
}
stack.Push(addResult);
continue;
case "-":
if (stack.Count < 2)
{
return(ErrorValue);
}
var substractResult = stack.Pop().Substract(stack.Pop());
if (substractResult.Equals(MachineValue.Invalid))
{
return(ErrorValue);
}
stack.Push(substractResult);
continue;
}
return(ErrorValue);
}
return(stack.Pop().Value);
}
