【c++学习】数据结构中的栈

栈

栈：先进后出
只对栈顶元素进行操作，包括新元素入栈、栈顶元素出栈和查看栈顶元素（只支持对栈顶的增、删、查）。

代码

下述代码实现了栈及其接口
包括对栈顶的增、删、查以及查看栈的大小

用线性表实现栈

#include 
using namespace std;

template<typename T>

class Stack{
private:
    T *data;
	int size;
	int capacity;
	void resize();
	
public:
	Stack() : data(new T[capacity]),size(0),capacity(10){}
	~Stack();
	void push(T element);
	T pop();
	T top() const;
	int getSize() const;
};

template<typename T>
void Stack<T>::resize(){
    int newCapacity = 2*capacity;
	T *newData = new T[newCapacity];
	for(int i = 0; i < size; i++){
	    newData[i] = data[i];
	}
	delete[] data;
	data = newData;
	capacity = newCapacity;
}

template<typename T>
Stack<T>::~Stack(){
   delete[] data;
}

template<typename T>
void Stack<T>::push(T element){
    if(size == capacity){
	    resize();
	}
	data[size++] = element;
}

template<typename T>
T Stack<T>::pop(){
    if(size == 0){
	    throw std::underflow_error("Stack is empty");
	}
	return data[--size];
}

template<typename T>
T Stack<T>::top() const{
    if(size == 0){
	    throw std::underflow_error("Stack is empty");
	}
	return data[size-1];
}

template<typename T>
int Stack<T>::getSize() const{
    return size;
}
int main()
{
    Stack<int> st;
	st.push(1);
	st.push(2);
	st.push(3);
	cout << st.getSize() << endl;
	
	cout << st.top() << endl;
	
	st.pop();
	cout << st.getSize() << endl;
	
	cout << st.top() << endl;	
   return 0;
}

用链表实现栈

#include 
using namespace std;

template<typename T>


class Stack{
private:
    struct Node{
        T data;
	    Node *next;
		Node(T d) : data(d),next(NULL){}
    };
	Node *head;
	int size;
	
public:
	Stack() : head(NULL), size(0){}
	~Stack();
	void push(T element);
	T pop();
	T top() const;
	int getSize() const;
};

template<typename T>
Stack<T>::~Stack(){
   while(head){
       Node *temp = head;
	   head = head->next;
	   delete temp;
   }
}

template<typename T>
void Stack<T>::push(T element){
    Node *newNode = new Node(element);
	newNode->next = head;
	head = newNode;
	size++;
}

template<typename T>
T Stack<T>::pop(){
    if(head == NULL){
	    throw std::underflow_error("Stack is empty");
	}
	T result = head->data;
	Node *temp = head;
	head = head->next;
	delete temp;
	size--;
	return result;
}

template<typename T>
T Stack<T>::top() const{
    if(head == NULL){
	    throw std::underflow_error("Stack is empty");
	}
	return head->data;
}

template<typename T>
int Stack<T>::getSize() const{
    return size;
}
int main()
{
    Stack<int> st;
	st.push(1);
	st.push(2);
	st.push(3);
	cout << st.getSize() << endl;
	
	cout << st.top() << endl;
	
	st.pop();
	cout << st.getSize() << endl;
	
	cout << st.top() << endl;	

}

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于 2024-01-26 第一次整理编写

学习时整理，不当之处烦请指正
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