1.链栈结构
typedef struct StackNode { SElemType data; struct StackNode *next; }StackNode,*LinkStackPtr; typedef struct { LinkStackPtr top; int count; }LinkStack;
2.构造一个空栈S
Status InitStack(LinkStack *S) { S->top = (LinkStackPtr)malloc(sizeof(StackNode)); if(!S->top) return ERROR; S->top=NULL; S->count=0; return OK; }
3. 把S置为空栈
Status ClearStack(LinkStack *S) { LinkStackPtr p,q; p=S->top; while(p) { q=p; p=p->next; free(q); } S->count=0; return OK; }
4. 若栈S为空栈,则返回TRUE,否则返回FALSE
Status StackEmpty(LinkStack S) { if (S.count==0) return TRUE; else return FALSE; }
5. 返回S的元素个数,即栈的长度
int StackLength(LinkStack S) { return S.count; }
6.若栈不空,则用e返回S的栈顶元素,并返回OK;否则返回ERROR
Status GetTop(LinkStack S,SElemType *e) { if (S.top==NULL) return ERROR; else *e=S.top->data; return OK; }
7. 插入元素e为新的栈顶元素
Status Push(LinkStack *S,SElemType e) { LinkStackPtr s=(LinkStackPtr)malloc(sizeof(StackNode)); s->data=e; s->next=S->top; /* 把当前的栈顶元素赋值给新结点的直接后继,见图中① */ S->top=s; /* 将新的结点s赋值给栈顶指针,见图中② */ S->count++; return OK; }
8.若栈不空,则删除S的栈顶元素,用e返回其值,并返回OK;否则返回ERROR
Status Pop(LinkStack *S,SElemType *e) { LinkStackPtr p; if(StackEmpty(*S)) return ERROR; *e=S->top->data; p=S->top; /* 将栈顶结点赋值给p,见图中③ */ S->top=S->top->next; /* 使得栈顶指针下移一位,指向后一结点,见图中④ */ free(p); /* 释放结点p */ S->count--; return OK; }
9.显示全部数据
Status StackTraverse(LinkStack S) { LinkStackPtr p; p=S.top; while(p) { visit(p->data); p=p->next; } printf("\n"); return OK; }
Status visit(SElemType c) { printf("%d ",c); return OK; }
参考<<大话数据结构>>
原文地址:http://blog.csdn.net/wangxiaobupt/article/details/26751797