c語言_構建一個靜態(tài)二叉樹實現(xiàn)方法

更新時間：2017年05月28日 11:11:57 投稿：jingxian

下面小編就為大家?guī)硪黄猚語言_構建一個靜態(tài)二叉樹實現(xiàn)方法。小編覺得挺不錯的，現(xiàn)在就分享給大家，也給大家做個參考。一起跟隨小編過來看看吧

第一、樹的構建

定義樹結構

struct BTNode { 
  char data; 
  struct BTNode* pLChild; 
  struct BTNode* pRChild; 
};

靜態(tài)方式創(chuàng)建一個簡單的二叉樹

struct BTNode* create_list() { 
 
  struct BTNode* pA = (struct BTNode*)malloc(sizeof(BTNode)); 
  struct BTNode* pB = (struct BTNode*)malloc(sizeof(BTNode)); 
  struct BTNode* pC = (struct BTNode*)malloc(sizeof(BTNode)); 
  struct BTNode* pD = (struct BTNode*)malloc(sizeof(BTNode)); 
  struct BTNode* pE = (struct BTNode*)malloc(sizeof(BTNode)); 
   
  pA->data = 'A'; 
  pB->data = 'B'; 
  pC->data = 'C'; 
  pD->data = 'D'; 
  pE->data = 'E';  
 
  pA->pLChild = pB; 
  pA->pRChild = pC; 
  pB->pLChild = pB->pRChild = NULL; 
 
  pC->pLChild = pD; 
  pC->pRChild = NULL; 
 
  pD->pLChild = NULL; 
  pD->pRChild = pE; 
 
  pE->pLChild = pE->pRChild = NULL; 
 
  return pA; 
}

第二、樹的三種遍歷

1. 先序遍歷

//先序輸出 
void PreTravense(struct BTNode* pHead) { 
  if (NULL!= pHead) 
  { 
    printf("%c", pHead->data); 
    if (NULL!= pHead->pLChild) 
    { 
      PreTravense(pHead->pLChild); 
    } 
    if (NULL != pHead->pRChild) 
    { 
      PreTravense(pHead->pRChild); 
    } 
  } 
}

2. 中序遍歷

//中序輸出 
void InTravense(struct BTNode* pHead) { 
  if (NULL != pHead) 
  { 
    if (NULL != pHead->pLChild) 
    { 
      PreTravense(pHead->pLChild); 
    } 
    printf("%c", pHead->data); 
     
    if (NULL != pHead->pRChild) 
    { 
      PreTravense(pHead->pRChild); 
    } 
  } 
}

3.后續(xù)遍歷

//后序輸出 
void PostTravense(struct BTNode* pHead) { 
  if (NULL != pHead) 
  { 
    if (NULL != pHead->pLChild) 
    { 
      PreTravense(pHead->pLChild); 
    }    
 
    if (NULL != pHead->pRChild) 
    { 
      PreTravense(pHead->pRChild); 
    } 
    printf("%c", pHead->data); 
  } 
}

第三、最終運行測試

int main() { 
  printf("創(chuàng)建序列\(zhòng)n"); 
  struct BTNode* pHead = create_list(); 
 
  printf("先序輸出\n"); 
  PreTravense(pHead); 
  printf("中序輸出\n"); 
  InTravense(pHead); 
  printf("后序輸出\n"); 
  PostTravense(pHead); 
  return 0; 
}