Visual Studio C++ 在使用模板时向控制台输出奇怪的字符

Question

当我尝试使用 VS 2013 将某些字符输出到控制台时，我运行遇到了问题。

这是角色的样子（在 2 之后）。我已经用“+-/*”符号进行了测试，每个符号都会出现这种情况。

基本上，我的程序使用堆栈 class 作为模板来保存字符，然后再提取这些字符。这是我的堆栈 class.

#include <assert.h>

template <class Item>
class stack
{
public:
    //TYPEDEFS AND MEMBER CONSTANT
    typedef int size_type; 
    typedef Item value_type;
    static const size_type CAPACITY = 30;
    //Constructor
    stack() { used = 0; } //Postcondition: The stack has been initialized as an empty stack.
    //Modification member functions
    void push(const Item& entry); //Precondition: size() < CAPACITY. Postcondition: A new copy of entry has been pushed onto the stack.
    void pop(); //Precondition: size() > 0. Postcondition:The top item of the stack has been removed.
    //Constant member functions
    bool empty() const { return (used == 0); } //Postcondition: The return value is true if the stack is empty, and false otherwise.
    size_type size() const { return used; } //Postcondition: The return value is the total number of items in the stack.
    Item top() const; //Precondition: size() > 0. Postcondition: The return value is the top item of the stack, but the stack is unchanged. This differs slightly from the STL stack (where the top function returns a reference to the item on top of the stack).
private:
    Item data[CAPACITY]; //Partially filled array.
    size_type used;
};

template <class Item>
void stack<Item>::push(const Item& entry) {
    assert(size() < CAPACITY);
    data[used] = entry;
    used++;
}

template <class Item>
void stack<Item>::pop() {
    assert(size() > 0);
    used--;
}

template <class Item>
Item stack<Item>::top() const {
    assert(size() > 0);
    return data[used];
}

然后我的驱动程序使用 myStack.push(pString[pos]); 来保存一个字符，它稍后用 cout << myStack.top();

输出

有谁知道如何让它显示正确的字符吗？谢谢。

Answer 1

这个：

template <class Item>
Item stack<Item>::top() const {
    assert(size() > 0);
    return data[used];
}

将 return 结束，因为 used == size()。你想要：

return data[used - 1];

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