栈

顺序存储结构栈

---

#include
//栈的顺序结构
#define MAXSIZE 100
#define SIZE sizeof(stack)
typedef struct {
  int data[MAXSIZE];
  int top;
}stack;

stack *initStack();
int Empty(stack *s);
int pushStack(stack *s, int d);
int popStack(stack *s, int *d);
int topStack(stack *s, int *d);

int main(){
  stack *s = initStack();
  pushStack(s,1);
  pushStack(s,2);
  pushStack(s,3);
  while (!Empty(s)) {
    int data;
    topStack(s,&data);
    printf("top=%d,", data);
    popStack(s,&data);
    printf("pop=%d\n", data);
  }
  return 0;
}

//栈初始化
stack *initStack(){
  stack *p;
  p = (stack*)malloc(SIZE);
  p->top = -1;
  return p;
}
//判空
int Empty(stack *s){
  if(s->top == -1)
    return 1;
  return 0;
}
//入栈
int pushStack(stack *s, int d){
  if (s->top == MAXSIZE-1)
    return 0;
  s->top++;
  s->data[s->top] = d;
  return 1;
}
//出栈
int popStack(stack *s, int *d){
  if(Empty(s))
    return 0;
  *d = s->data[s->top];
  s->top--;
  return 1;
}
//读取栈顶元素
int topStack(stack *s, int *d){
  if(Empty(s))
    return 0;
  *d = s->data[s->top];
  return 1;
}

共享栈

---

#include

#define MAXSIZE 100
#define SIZE sizeof(dupsqstack)

typedef struct {
  int data[MAXSIZE];
  int lefttop;
  int righttop;
}dupsqstack;

dupsqstack *initDupsqstack();
int Empty(dupsqstack *s, char status);
int pushDupStack(dupsqstack *s, char status, int d);
int popDupStack(dupsqstack *s, char status, int *d);
int topDupStack(dupsqstack *s, char status, int *d);

int main(){
  dupsqstack *s = initDupsqstack();
  printf("emptyL-%d,emptyR-%d\n", Empty(s,'L'), Empty(s,'R'));

  pushDupStack(s,'L',1);
  pushDupStack(s,'L',2);
  pushDupStack(s,'L',3);

  pushDupStack(s,'R',1);
  pushDupStack(s,'R',2);
  pushDupStack(s,'R',3);

  while (!Empty(s,'L') && !Empty(s,'R')) {
    int l,r;
    topDupStack(s,'L', &l);
    topDupStack(s,'R', &r);
    printf("topL=%d,topR=%d\n", l, r);

    popDupStack(s,'L', &l);
    popDupStack(s,'R', &r);
    printf("popL=%d,popR=%d\n", l, r);
  }
  return 0;
}

//栈初始化
dupsqstack *initDupsqstack(){
  dupsqstack *s = (dupsqstack*)malloc(SIZE);
  s->lefttop = -1;
  s->righttop = MAXSIZE;
  return s;
}

//栈判空
int Empty(dupsqstack *s, char status){
  switch (status) {
    case 'L':
      if (s->lefttop == -1)
        return 1;
      break;
    case 'R':
      if (s->righttop == MAXSIZE)
        return 1;
      break;
    default:
      printf("输入错误\n");
      break;
  }
  return 0;
}

//入栈
int pushDupStack(dupsqstack *s, char status, int d){
  if (s->lefttop + 1 == s->righttop)
    return 0;
  switch (status) {
    case 'L':
      s->data[++s->lefttop] = d;
      break;
    case 'R':
      s->data[--s->righttop] = d;
      break;
    default:
      printf("输入错误\n");
      return 0;
      break;
  }
  return 1;
}
//出栈
int popDupStack(dupsqstack *s, char status, int *d){
  if (Empty(s,status))
    return 0;
  switch (status) {
    case 'L':
      *d = s->data[s->lefttop--];
      break;
    case 'R':
      *d = s->data[s->righttop++];
      break;
    default:
      printf("输入错误\n");
      return 0;
      break;
  }
  return 1;
}

//栈顶元素
int topDupStack(dupsqstack *s, char status, int *d){
  if (Empty(s,status))
    return 0;
  switch (status) {
    case 'L':
      *d = s->data[s->lefttop];
      break;
    case 'R':
      *d = s->data[s->righttop];
      break;
    default:
      printf("输入错误\n");
      return 0;
      break;
  }
  return 1;
}

链式存储结构栈

---

#include

#define SIZE sizeof(stackNode)

typedef struct stackNode{
  int data;
  struct stackNode *next;
}stackNode;

stackNode *initStackList();
int stackEmpty(stackNode *head);
int pushStack(stackNode *head, int d);
int popStack(stackNode *head, int *d);
int topStack(stackNode *head, int *d);

int main(){
    stackNode *head = initStackList();
    printf("isEmpty = %d\n", stackEmpty(head));
    pushStack(head,1);
    pushStack(head,2);
    pushStack(head,3);

    while (!stackEmpty(head)) {
      int d;
      topStack(head,&d);
      printf("top=%d,", d);
      popStack(head,&d);
      printf("pop=%d\n", d);
    }
    return 0;
}


//栈链表初始化
stackNode *initStackList(){
  stackNode *p = (stackNode*)malloc(SIZE);
  p->next = NULL;
  return p;
}

//栈链表判空
int stackEmpty(stackNode *head){
  if(head->next == NULL)
    return 1;
  return 0;
}

//栈链表入栈
int pushStack(stackNode *head, int d){
  stackNode *new;
  if ((new = (stackNode*)malloc(SIZE)) == NULL) {
    return 0;
  }
  new->data = d;
  new->next = head->next;
  head->next = new;
  return 1;
}

//栈链表出栈
int popStack(stackNode *head, int *d){
  if (stackEmpty(head)) {
    return 0;
  }
  stackNode *p = head->next;
  *d = p->data;
  head->next = p->next;
  // free(p);
  return 1;
}

//栈链表栈顶元素
int topStack(stackNode *head, int *d){
  if (stackEmpty(head)) {
    return 0;
  }
  stackNode *p = head->next;
  *d = p->data;
  return 1;
}