public PrgState OneStep(PrgState state)
{
MyIStack <IStmt> stk = state.GetExeStack();
if (stk.IsEmpty())
{
throw new MyException("Stack is empty");
}
IStmt crtStmt = stk.Pop();
return(crtStmt.Execute(state));
}
public PrgState OneStep(PrgState state)
{
IMyStack <IStmt> stk = state.ExeStack;
if (stk.IsEmpty())
{
throw new Exception("The execution stack is empty");
}
IStmt crtStmt = stk.Pop();
return(crtStmt.Execute(state));
}
private PrgState OneStep(PrgState state)
{
IExeStack <IStmt> stk = state.ExeStack;
if (stk.IsEmpty())
{
throw new Exception("Empty stack");
}
IStmt crtStmt = stk.Pop();
return(crtStmt.Execute(state));
}
public PrgState OneStep()
{
IStmt crtStmt = null;
if (exeStack.IsEmpty())
{
Console.Write("empty stack!! \n");
return(null);
}
else
{
crtStmt = exeStack.Pop();
}
return(crtStmt.Execute(this));
}