栈代码演示
栈代码演示
#include <stdio.h>
#include <malloc.h>
#include <stdlib.h>
//节点结构体
typedef struct Node
{
int data;
struct Node * pNext;
}Node, *pNode;
//栈结构体
typedef struct Stack
{
pNode ptop;
pNode pbottom;
}Stack, *pStack;
void init_stack(pStack pstack);
void push_stack(pStack pstack, int val);
void show_stack(pStack pstack);
void pop_stack(pStack pstack, int *val);
void clear_stack(pStack pstack);
void main(void)
{
Stack stack;
int val;
init_stack(&stack);
push_stack(&stack, 4);
push_stack(&stack, 5);
push_stack(&stack, 6);
show_stack(&stack);
pop_stack(&stack, &val);
printf("出栈元素的值为: %d\n", val);
show_stack(&stack);
clear_stack(&stack);
show_stack(&stack);
return;
}
/*
函数名:init_stack
作用:初始化一个栈
输入:pStack pstack
输出:无
*/
void init_stack(pStack pstack)
{
pNode p;
p = (pNode)malloc(sizeof(Node));
p->pNext = NULL;
if (p == NULL)
{
return;
}
pstack->pbottom = p;
pstack->ptop = p;
return;
}
/*
函数名:push_stack
作用:向栈内压入一个元素
输入:pStack pstack, int val(压入栈中的值)
输出:无
*/
void push_stack(pStack pstack, int val)
{
pNode p;
p = (pNode)malloc(sizeof(Node));
p->data = val;
if (p == NULL)
{
return;
}
p->pNext = pstack->ptop; //注意p->pNext 指向 栈顶
pstack->ptop = p;
return;
}
/*
函数名:show_stack
作用:显示栈中的元素
输入:pStack pstack
输出:无
*/
void show_stack(pStack pstack)
{
pNode p;
p = (pNode)malloc(sizeof(Node));
if (p == NULL)
{
return;
}
p = pstack->ptop;
printf("stack中的元素为:");
if (pstack->pbottom == pstack->ptop)
{
printf("空");
}
while (p != pstack->pbottom)
{
printf("%d、", p->data);
p = p->pNext;
}
printf("\n");
return;
}
/*
函数名:pop_stack
作用:出栈一个元素
输入:pStack pstack, int *val(出栈元素的值)
输出:无
*/
void pop_stack(pStack pstack, int *val)
{
pNode p;
p = (pNode)malloc(sizeof(Node));
if (p == NULL)
{
return;
}
p = pstack->ptop;
*val = p->data;
pstack->ptop = p->pNext;
free(p);
return;
}
/*
函数名:clear_stack
作用:清空栈
输入:pStack pstack
输出:无
*/
void clear_stack(pStack pstack)
{
pNode p;
p = (pNode)malloc(sizeof(Node));
if (p == NULL)
{
return;
}
while (p != pstack->pbottom)
{
p = pstack->ptop;
pstack->ptop = p->pNext;
free(p);
p = pstack->ptop;
}
return;
}
我们向往远方,却忽略了此刻的美丽