public PrgState oneStep()
{
try {
IStmt crtStmt = exeStack.Pop();
return(crtStmt.execute(this));
} catch (EmptyStackException) {
throw new MyStmtExecException();
}
}
/// <summary>
/// Calculating exression written in postfix
/// </summary>
/// <param name="stack"></param>
/// <param name="line"></param>
/// <returns></returns>
public static int Calculator(StackInterface stack, string line)
{
int mainResult = 0;
for (int i = 0; i != line.Length; i++)
{
char symbol = line[i];
if (symbol != '-' && symbol != '*' && symbol != '/' && symbol != '+' && symbol != ' ')
{
stack.Push(Convert.ToInt16(symbol) - 48);
}
else
{
switch (symbol)
{
case '+':
{
int result = 0;
result += stack.Pop();
result += stack.Pop();
stack.Push(result);
break;
}
case '-':
{
int result = 0;
result -= stack.Pop();
result += stack.Pop();
stack.Push(result);
break;
}
case '*':
{
int result = 1;
result *= stack.Pop();
result *= stack.Pop();
stack.Push(result);
break;
}
case '/':
{
int tempor = stack.Pop();
if (tempor != 0)
{
int result = 0;
result = stack.Pop() / tempor;
stack.Push(result);
break;
}
else
{
throw new DivideByZeroException();
}
}
default:
{
continue;
}
}
}
}
if (mainResult != -99999)
{
mainResult = stack.Pop();
return(mainResult);
}
else
{
return(mainResult);
}
}
/// <summary>
/// Calculating exression written in postfix
/// </summary>
/// <param name="stack"></param>
/// <param name="line"></param>
/// <returns></returns>
public static int Calculator(StackInterface stack, string line)
{
int mainResult = 0;
for (int i = 0; i != line.Length; i++)
{
char symbol = line[i];
if (symbol != '-' && symbol != '*' && symbol != '/' && symbol != '+' && symbol != ' ')
{
stack.Push(Convert.ToInt16(symbol) - 48);
}
else switch (symbol)
{
case '+':
{
int result = 0;
result += stack.Pop();
result += stack.Pop();
stack.Push(result);
break;
}
case '-':
{
int result = 0;
result -= stack.Pop();
result += stack.Pop();
stack.Push(result);
break;
}
case '*':
{
int result = 1;
result *= stack.Pop();
result *= stack.Pop();
stack.Push(result);
break;
}
case '/':
{
int tempor = stack.Pop();
if (tempor != 0)
{
int result = 0;
result = stack.Pop() / tempor;
stack.Push(result);
break;
}
else
{
throw new DivideByZeroException();
}
}
default:
{
continue;
}
}
}
if (mainResult != -99999)
{
mainResult = stack.Pop();
return mainResult;
}
else
{
return mainResult;
}
}