数据结构(2) -- 堆栈

1、顺序存储

//栈的顺序存储实现
//Stack.h
#ifndef STACK_H_
#define STACK_H_
#define ElementType int
#define MaxSize 100
typedef struct _Node
{
    ElementType data[MaxSize];
    int top;
}Node;
class Stack
{
private:
    Node data;
public:
    Stack();
    ~Stack();
    int IsFull();
    void Push(ElementType item);
    int IsEmpty();
    ElementType Pop();
};
#endif

//Stack.cpp
#include "Stack.h"
#include <iostream>

Stack::Stack()
{
    data.top = -1;
}
Stack::~Stack()
{
}
int Stack::IsFull()
{
    if (data.top == (MaxSize - 1))
        return 1;
    else
        return 0;
}
void Stack::Push(ElementType item)
{
    if (IsFull() == 1)
    {
        std::cout << "栈溢出" << std::endl;
        return;
    }
    data.data[++(data.top)] = item;
}

int Stack::IsEmpty()
{
    if (data.top == -1)
        return 1;
    else
        return 0;
}

ElementType Stack::Pop()
{
    if (IsEmpty())
        std::cout << "栈已空" << std::endl;
    return data.data[(data.top)--];
}

2、链式存储

//栈的链式存储实现
//PStack.h
#ifndef PSTACK_H_
#define PSTACK_H_
#define ElementType int
#define MaxSize 100
typedef struct _PNode
{
    ElementType data;
    _PNode* next;
}PNode;

class PStack
{
private:
    PNode *top;
public:
    PStack();
    ~PStack();
    int IsFull();
    void Push(ElementType item);
    int IsEmpty();
    ElementType Pop();
};
#endif

//PStack.cpp
#include "PStack.h"
#include <iostream>

PStack::PStack()
{
    top = new PNode();
    top->next = NULL;
}
PStack::~PStack()
{
    delete top;
}

void PStack::Push(ElementType item)
{
    PNode* s = new PNode();
    s->data = item;
    s->next = top;
    top = s;
}

int PStack::IsEmpty()
{
    if (top == NULL)
        return 1;
    else
        return 0;
}

ElementType PStack::Pop()
{
    if (IsEmpty())
        std::cout << "栈已空" << std::endl;
    PNode *s;
    s = top;
    ElementType e = s->data;
    top = top->next;
    delete s;
    return e;
}

3、测试样例

#include <iostream>
#include "PStack.h"
using namespace std;

int main()
{
    PStack st;
    st.Push(5);
    st.Push(6);
    st.Push(2);
    int a = st.Pop();
    int b = st.Pop();
    cout << "a , b" << a << " " << b << endl;
    st.Push(b / a);
    a = st.Pop();
    b = st.Pop();
    cout << "a , b" << a << " " << b << endl;
    st.Push(b + a);
    st.Push(3);
    st.Push(4);
    a = st.Pop();
    b = st.Pop();
    cout << "a , b" << a << " " << b << endl;
    st.Push(b * a);
    a = st.Pop();
    b = st.Pop();
    st.Push(b - a);
    cout << "a , b" << a << " " << b << endl;
    cout << "根据后缀表达是计算5+6/2-3*4的值为：" << st.Pop() << endl;

    system("pause");
    return 0;
}