public PrgState Execute(PrgState state)
{
MyIStack <IStmt> stk = state.GetExeStack();
stk.Push(snd);
stk.Push(first);
return(state);
}
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 Execute(PrgState state)
{
MyIStack <IStmt> stk = state.GetExeStack();
MyIDictionary <String, int> symtbl = state.GetSymTable();
if (exp.Eval(symtbl) != 0)
{
stk.Push(thenS);
}
else
{
stk.Push(elseS);
}
return(state);
}
public PrgState Execute(PrgState state)
{
MyIStack <IStmt> stk = state.GetExeStack();
MyIDictionary <String, int> symTbl = state.GetSymTable();
int val = exp.Eval(symTbl);
if (symTbl.IsDefinedU(id))
{
symTbl.Update(id, val);
}
else
{
symTbl.Add(id, val);
}
return(state);
}