#include <stdio.h>#include <stdlib.h> #include <string.h>#define NUM 4 struct tree{  char name[20];  char city[20];  char sex[10];  char age[10];  char job[10];  struct tree *left;  struct tree *right;}; struct tree Datas[NUM]={  "Willing","Tianjing","Female","21","worker",NULL,NULL,  "Tom","Beijing","Male","31","doctor",NULL,NULL,  "Sun","Weifang","Male","24","student",NULL,NULL,  "Marry","Shanghai","Female","19","techer",NULL,NULL}; struct tree *construct(  struct tree *root,   struct tree *r,   struct tree *Data){  if(!r)  {    r = (struct tree *)malloc(sizeof(struct tree));    if(!r)    {      printf("內存分配失敗！");      exit(0);    }    r->left = NULL;    r->right = NULL;    strcpy(r->name,Data->name);    strcpy(r->city,Data->city);    strcpy(r->sex,Data->sex);    strcpy(r->age,Data->age);    strcpy(r->job,Data->job);    if(!root)      return r;    if(strcmp(Data->name,root->name)<0)      root->left = r;    else      root->right = r;    return r;  }  if(strcmp(Data->name,r->name)<0)    construct(r,r->left,Data);  else    construct(r,r->right,Data);   return root;  } struct tree *Search(root,name)struct tree *root;char name[];{  struct tree *p;  if(root == NULL)    printf("該樹為空/n");  p = root;  while(strcmp(p->name,name)!=0)  {    if(strcmp(p->name,name)>0)      p = p->left;    else      p = p->right;    if(p == NULL)      break;  }  return(p);} void print(struct tree *r){  if(!r)    return;  print(r->left);  printf("%s/n",r->name);  print(r->right);} void print_currentData(struct tree *point){  if(point == NULL)    return;  printf("  姓名：%s/n",point->name);  printf("  城市：%s/n",point->city);  printf("  性別：%s/n",point->sex);  printf("  年齡：%s/n",point->age);  printf("  工作：%s/n",point->job);} int main(void){  int i;  char c[10];  char swap[20];  char name[20];  struct tree *root,*p;  struct tree *temp;  p = NULL;  temp = NULL;  root = NULL;  for(i = 0;i<NUM;i++)    root =construct(root,root,&Datas[i]);  printf("現有人員資料：/n");  print(root);  printf("請輸入要查找的人的名字/n");  scanf("%s",name);  p = Search(root,name);  if(p == NULL)  {    printf("沒有該人資料/n");    printf("是否要插入該人資料[y/n]/n");    scanf("%s",c);    if(strcmp(c,"y")==0)    {      temp = (struct tree *)malloc(sizeof(struct tree));      if(!temp)      {        printf("內存分配失敗！");        exit(0);      }      printf("請輸入該人姓名：/n");      scanf("%s",swap);      strcpy(temp->name,swap);      printf("請輸入該人所在城市：/n");      scanf("%s",swap);      strcpy(temp->city,swap);      printf("請輸入該人性別[Male/Female]：/n");      scanf("%s",swap);      strcpy(temp->sex,swap);      printf("請輸入該人年齡：/n");      scanf("%s",swap);      strcpy(temp->age,swap);      printf("請輸入該人工作：/n");      scanf("%s",swap);      strcpy(temp->job,swap);      temp->left = NULL;      temp->right = NULL;      root =construct(root,root,temp);      print_currentData(temp);      printf("現有人員資料：/n");      root = root;      print(root);    }    else      return 0;  }  print_currentData(p);  return 1;}