节点删除功能的链表问题

我目前正在开发一个链表，它在列表的前面存储偶数整数，在后面存储奇数整数。对我来说，一切都很好，除了我的删除功能，它接受用户输入，决定他们是想删除偶数还是奇数整数，并将其用作从列表前面或后面删除的提示。这是我的节点删除功能的代码：

void Staque::pop(char EvenOrOdd)
{
    if (!empty())
    {
        if (EvenOrOdd == 'O' || 'o')
        {
            //Creating pointers to find end of Staque
            Staque::NodePointer prevPtr = myTop, //Pointer to find penultimate Node and set "next" value to 0
                currentPtr = myTop; //Pointer to find Node to delete
            //Assigning pointers to corresponding nodes
            while (prevPtr->next->next != 0)
            {
                prevPtr = prevPtr->next;
            }
            while (currentPtr->next != 0)
            {
                currentPtr = currentPtr->next;
            }
            //Deleting the last node in the Staque and setting "next" value of new end to 0
            delete currentPtr;
            prevPtr->next = 0;
        }
        else if (EvenOrOdd == 'e' || 'E')
        {
            Staque::NodePointer ptr = myTop;
            myTop = myTop->next;
            delete ptr;
        }
    }
    else
    {
        cerr << "Stack is empty -- can't remove a value n";
    }

问题是，它不需要输入来决定删除哪种元素。它只是删除我在节点删除函数的if构造中首先放入的内容。如果在If构造中，我在删除赔率的代码之上有删除偶数的代码，那么它只会删除偶数，反之亦然。请帮忙，我不明白它为什么这么做。