棧的組織形式:
如上圖所示:棧也是有多個數據節點組成的,每個節點包含有數據域和指向下一個節點的指針域。並且每次的push、pop和判空都是操作的棧頂指針top。
棧中每個數據節點的定義:
class data_node{
public:
data_node() :data(0), next(NULL){}//default constructer function
data_node(int value) :data(value), next(NULL){}//include arg constructer function
int data;
data_node *next;//pointer that point to next node
};
棧的類的定義:
class my_stack{
public:
my_stack() :top(NULL){}
void push(data_node new_data);
void pop(data_node *pop_node);
bool empty();
data_node *top;
};
棧的push操作:
void my_stack::push(data_node new_data)
{
data_node *pnode = NULL;
pnode = new data_node(new_data.data);
pnode->next = top;
top = pnode;
}
void my_stack::pop(data_node *pop_node)
{
if (empty())
{
printf("this stack is empty\n");
return;
}
pop_node->data = top->data;
data_node *pnode = top;
top = top->next;
delete pnode;
}
bool my_stack::empty()
{
return (top == NULL);
}
完整的代碼如下:
#include "stdafx.h"
#include <iostream>
#pragma warning(disable:4996)
#include <string>
using namespace std;
class data_node{
public:
data_node() :data(0), next(NULL){}//default constructer function
data_node(int value) :data(value), next(NULL){}//include arg constructer function
int data;
data_node *next;//pointer that point to next node
};
class my_stack{
public:
my_stack() :top(NULL){}
void push(data_node new_data);
void pop(data_node *pop_node);
bool empty();
data_node *top;
};
void my_stack::push(data_node new_data)
{
data_node *pnode = NULL;
pnode = new data_node(new_data.data);
pnode->next = top;
top = pnode;
}
void my_stack::pop(data_node *pop_node)
{
if (empty())
{
printf("this stack is empty\n");
return;
}
pop_node->data = top->data;
data_node *pnode = top;
top = top->next;
delete pnode;
}
bool my_stack::empty()
{
return (top == NULL);
}
int main()
{
data_node pop_node(0);
my_stack stack;
stack.push(3);
stack.push(2);
stack.push(6);//3,2,6
stack.pop(&pop_node);
//printf("is empty? %d\n", stack.empty());
printf("%2d ", pop_node.data);
stack.pop(&pop_node);
//printf("is empty? %d\n", stack.empty());
printf("%2d ", pop_node.data);
stack.pop(&pop_node);
printf("%2d\n ", pop_node.data);
printf("is empty? %d\n", stack.empty());
return 0;
}