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#include<stdio.h> #include<malloc.h> #include<stdlib.h> //動(dòng)態(tài)棧,由鏈表實(shí)現(xiàn) ,上面節(jié)點(diǎn)指向下面一個(gè)節(jié)點(diǎn) //結(jié)構(gòu)體:節(jié)點(diǎn)(表示一個(gè)元素) typedef struct Node { int data; struct Node * pNext; }NODE,*PNODE; //結(jié)構(gòu)體:棧,棧頂節(jié)點(diǎn)的指針,棧底節(jié)點(diǎn)指針(棧底指針指向棧底節(jié)點(diǎn)的下一個(gè)存儲(chǔ)空間,因?yàn)槭浅跏蓟臅r(shí)候分配的空間,此時(shí)還沒(méi)有插入節(jié)點(diǎn))。 typedef struct Stack { PNODE pTop; PNODE pButtom; } STACK,*PSTACK; //為棧分配內(nèi)存 void init(PSTACK pStack); //壓棧 void push(PSTACK pStack,int val); //遍歷 void traverse(PSTACK pStack); //彈棧,把出棧的節(jié)點(diǎn)的數(shù)據(jù)存入給定的變量中(給地址) bool pop(PSTACK pStack,int * val); int main(void) { //初始化 STACK stack; init(&stack); //壓棧 push(&stack,1); push(&stack,2); push(&stack,3); push(&stack,4); //遍歷 traverse(&stack); //彈棧 int a = 0; pop(&stack,&a); printf("\n出棧的元素是:%d\n",a); //遍歷 traverse(&stack); getchar(); return 0; } //初始化棧 void init(PSTACK pStack) { //為節(jié)點(diǎn)分配內(nèi)存 pStack->pTop = (PNODE)malloc(sizeof(NODE)); if(pStack->pTop == NULL) { printf("動(dòng)態(tài)內(nèi)存分配失敗!\n"); exit(-1); }else { //棧頂指針和棧底指針相等 ,都指向初始節(jié)點(diǎn) pStack->pButtom = pStack->pTop; pStack->pTop->pNext = NULL; //初始節(jié)點(diǎn)的下個(gè)節(jié)點(diǎn)為NULL } } //壓棧 void push(PSTACK pStack,int val) { //創(chuàng)建一個(gè)節(jié)點(diǎn) PNODE pNewNode= (PNODE)malloc(sizeof(NODE)); pNewNode->data = val;//數(shù)據(jù)域賦值 pNewNode->pNext = NULL;//指針域?yàn)榭?棧頂) pNewNode->pNext = pStack->pTop;//新加入的節(jié)點(diǎn)的下一個(gè)節(jié)點(diǎn)指向原來(lái)的棧頂節(jié)點(diǎn) pStack->pTop = pNewNode;//棧頂指針指向新壓入的節(jié)點(diǎn) return; } //遍歷 void traverse(PSTACK pStack) { PNODE pNode = pStack->pTop; while(pNode != pStack->pButtom) { printf("%d\t",pNode->data); pNode = pNode->pNext; } } //彈棧 bool pop(PSTACK pStack,int * val) { if(pStack->pTop == pStack->pButtom) { return false; } *val = pStack->pTop->data; PNODE r= pStack->pTop;//記錄棧頂節(jié)點(diǎn) pStack->pTop = pStack->pTop->pNext; free(r); r=NULL;//釋放原來(lái)?xiàng)m敼?jié)點(diǎn)的空間 return true; }
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