简易通讯录1.0

C语言版本，具有增，删，查，改功能

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define T 1
#define F -1

struct Person
{
    char ID[10];
 char NAME[4];
 char NUM[20];
 struct Person* next;
};

int init(struct Person** head);
int insert(struct Person* head);
int delete_id(struct Person* head);
int delete_name(struct Person* head);
int delete_num(struct Person* head);
int update(struct Person* head);
int query_id(struct Person* head);
int query_name(struct Person* head);
int query_num(struct Person* head);
void print(struct Person* head);

int main()
{
 struct Person* head = NULL;
 init(&head);               //初始化

 print(head);

 char a[6];

 while (strcmp(a, "finish") != 0)
 {
  printf("You want to (insert/delete/query/update/finish): ");
  scanf("%s", a);

  if (strcmp(a, "insert") == 0)
  {
   insert(head);
   print(head);
  }
  if (strcmp(a, "delete") == 0)
  {
   char b[4];

   printf("The way you want to delete (id/name/num): ");
   scanf("%s", b);

   if (strcmp(b, "id") == 0)
   {
    delete_id(head);
    print(head);
   }
   else if (strcmp(b, "name") == 0)
   {
    delete_name(head);
    print(head);
   }
   else if (strcmp(b, "num") == 0)
   {
    delete_num(head);
    print(head);
   }
   else
   {
    printf("out of range\n");
   }
  }
  if (strcmp(a, "query") == 0)
  {
   char b[4];

   printf("The way you want to query (id/name/num): ");
   scanf("%s", b);

   if (strcmp(b, "id") == 0)
   {
    query_id(head);
   }
   else if (strcmp(b, "name") == 0)
   {
    query_name(head);
   }
   else if (strcmp(b, "num") == 0)
   {
    query_num(head);
   }
   else
   {
       printf("out of range\n");
   }
  }
  if (strcmp(a, "update") == 0)
  {
   update(head);
   print(head);
  }
 }

    return 0;
}

int init(struct Person** head)
{
    struct Person* newp = (struct Person*)malloc(sizeof(struct Person));

 if (NULL == newp)
 {
     return F;
 }
 
 newp->next = NULL;
 *head = newp;

 return T;
}

int insert(struct Person* head)
{
    struct Person* newp = (struct Person*)malloc(sizeof(struct Person));

 if(NULL == newp)
 {
     return F;
 }
 char id[10];
 char name[4];
 char num[20];

 printf("The ID is: ");
 scanf("%s", id);
 printf("The NAME is: ");
 scanf("%s", name);
 printf("The NUM is: ");
 scanf("%s", num);

 while ((head->next != NULL) && (strcmp(head->next->ID, id) < 0))
 {
  head = head->next;
 }
 strcpy(newp->ID, id);
 strcpy(newp->NAME, name);
 strcpy(newp->NUM, num);

 newp->next = head->next;
 head->next = newp;

 return T;
}

int delete_id(struct Person* head)
{
    char id[10];

    printf("The ID you want to delete is: ");
 scanf("%s", id);

 while (head->next != NULL)
 {
     if (strcmp(head->next->ID, id) == 0)
  {
   struct Person* temp = head->next->next;

   free(head->next);
      head->next = temp;

   return T;
  }
  else
  {
   head = head->next;
  }
 }
 if(head->next == NULL)
 {
  printf("out of range\n"); 

  return F;
 }
}

int delete_name(struct Person* head)
{
    char name[4];

    printf("The NAME you want to delete is: ");
 scanf("%s", name);

 while (head->next != NULL)
 {
     if (strcmp(head->next->NAME, name) == 0)
  {
   struct Person* temp = head->next->next;

   free(head->next);
      head->next = temp;

   return T;
  }
  else
  {
   head = head->next;
  }
 }
 if(head->next == NULL)
 {
  printf("out of range\n");

  return F;
 }
}

int delete_num(struct Person* head)
{
    char num[20];

    printf("The NUM you want to delete is: ");
 scanf("%s", num);

 while (head->next != NULL)
 {
     if (strcmp(head->next->NUM, num) == 0)
  {
   struct Person* temp = head->next->next;

   free(head->next);
      head->next = temp;

   return T;
  }
  else
  {
   head = head->next;
  }
 }
 if(head->next == NULL)
 {
  printf("out of range\n"); 

  return F;
 }
}

int update(struct Person* head)
{
    char id[10];
 char name[5];
 char num[20];

    printf("The ID you want to update is: ");
 scanf("%s", id);
 printf("The new NAME is: ");
 scanf("%s", name);
 printf("The new NUM is: ");
 scanf("%s", num);

 while (head->next != NULL)
 {
  if (strcmp(head->next->ID, id) == 0)
  {
   strcpy(head->next->NAME, name);
   strcpy(head->next->NUM, num);

   return T;
  }
  else
  {
   head = head->next;
  }
 }
 if (head->next == NULL)
 {
     printf("out of range\n");

  return F;
 }
}

int query_id(struct Person* head)
{
    char id[10];

 printf("The ID you want to query is: ");
 scanf("%s", id);

 while (head->next != NULL)
 {
  if (strcmp(head->next->ID, id) == 0)
  {
   printf("ID: %s\nNAME: %s\nNUM: %s\n", head->next->ID, head->next->NAME, head->next->NUM);

   return T;
  }
  else
  {
   head = head->next;
  }
 }
 if (head->next == NULL)
 {
  printf("out of range\n");

  return F;
 }
}

int query_name(struct Person* head)
{
    char name[4];

 printf("The NAME you want to query is: ");
 scanf("%s", name);

 while (head->next != NULL)
 {
  if (strcmp(head->next->NAME, name) == 0)
  {
   printf("ID: %s\nNAME: %s\nNUM: %s\n", head->next->ID, head->next->NAME, head->next->NUM);

   return T;
  }
  else
  {
   head = head->next;
  }
 }
 if (head->next == NULL)
 {
  printf("out of range\n");

  return F;
 }
}

int query_num(struct Person* head)
{
    char num[20];

 printf("The NUM you want to query is: ");
 scanf("%s", num);
 
 while (head->next != NULL)
 {
  if (strcmp(head->next->NUM, num) == 0)
  {
   printf("ID: %s\nNAME: %s\nNUM: %s\n", head->next->ID, head->next->NAME, head->next->NUM);

   return T;
  }
  else
  {
   head = head->next;
  }
 }
 if (head->next == NULL)
 {
  printf("out of range\n");

  return F;
 }
}

void print(struct Person* head)
{
 int count = 0;
 
 system("clear");
 printf("      ********************************************************************\n");
 printf("                   Welcome to the addressbook system!                     \n");
 printf("      ********************************************************************\n");
 printf("                       ID    NAME      NUM\n");
 printf("                    ----------------------------\n");

 while (head->next != NULL)
 {
  count++;
  printf("%d.  %s   %3s   %s\n", count, head->next->ID, head->next->NAME, head->next->NUM);
  head = head->next;
 }
 printf("                    ----------------------------\n");
}