定義
一種可以實現“先進後出”的存儲結構
棧類似於箱子
分類
靜態棧
動態棧
算法
出棧
壓棧
應用
函數調用
中斷
表達式求值
內存分配
緩衝處理
迷宮
實例
#include<stdio.h>
#include<malloc.h>
#include<stdlib.h>
typedef struct Node
{
int data;
struct Node * pNext;
}NODE, * PNODE;
typedef struct Stack
{
PNODE pTop; //頂部 棧外
PNODE pBottom; //底部
}STACK, * PSTACK;
void init(PSTACK pS);
void push(PSTACK pS,int val);
void traverse(PSTACK pS);
bool pop(PSTACK pS, int * pVal);
void clear(PSTACK pS);
bool empty(PSTACK pS);
int main()
{
STACK S; //申請一個內存空間
int val;
init(&S);
push(&S, 1); ///壓棧
push(&S, 2);
push(&S, 3);
push(&S, 4);
push(&S, 5);
traverse(&S);
if( pop(&S, &val) )
{
printf("出棧成功,出棧元素爲%d\n", val);
}
else
printf("出棧失敗");
traverse(&S);
clear(&S);
traverse(&S);
return 0;
}
void init(PSTACK pS)
{
pS->pTop = (PNODE)malloc(sizeof(NODE));
if(NULL == pS->pTop)
{
printf("動態內存分配失敗\n");
exit(-1);
}
else
{
pS->pBottom = pS->pTop;
pS->pTop->pNext = NULL;
}
}
void push(PSTACK pS,int val)
{
PNODE pNew = (PNODE)malloc(sizeof(NODE));
pNew->data = val;
pNew->pNext = pS->pTop; //指向pTop
pS->pTop = pNew;
return;
}
void traverse(PSTACK pS)
{
PNODE p = pS->pTop;
while(p != pS->pBottom)
{
printf("%d ", p->data);
//printf("1 ");
p = p->pNext;
}
printf("\n");
return;
}
bool empty(PSTACK pS)
{
if(pS->pTop == pS->pBottom)
return true;
else
return false;
}
//出棧
bool pop(PSTACK pS, int * pVal)
{
if(empty(pS)) //pS本身存放的S的地址
{
return false;
}
else
{
PNODE r = pS->pTop;
*pVal = r->data;
pS->pTop = r->pNext;
free(r);
r = NULL;
return true;
}
}
void clear(PSTACK pS)
{
if(empty(pS)) //pS本身存放的S的地址
{
return;
}
else
{
PNODE p = pS->pTop;
PNODE q = p->pNext;
while( p != pS->pBottom)
{
q = p->pNext;
free(p);
p = q;
}
pS->pTop = pS->pBottom;
}
}