C语言用函数实现电话簿管理系统

#include<stdio.h>

#include<string.h>


typedef struct Contact {
 char name[21];
 char phone[21];
 char QQ[21];
} CONTACT;


int AddContact(CONTACT cons[],int num){
 num++;
 printf("请输入姓名(最长20个字符)：");
 scanf("%s",&cons[num].name);
 printf("请输入QQ(最长20位)：");
 scanf("%s",&cons[num].QQ);
 printf("请输入手机号码（最长20位）：");
 scanf("%s",&cons[num].phone);
 printf("添加成功！\n");
 return num;
}


void showContact(CONTACT cons[],int num){
 printf("共有 %d 个联系人信息：\n", num);
 printf("===============================================================\n");
 printf("No.\t\t姓名\t\tQQ号\t\t联系电话\n");
 printf("---------------------------------------------------------------\n");
 for(int i = 1; i <= num; i++){
 printf("%d\t\t%s\t\t%s\t%s\t\t\n", i, cons[i].name, cons[i].QQ, cons[i].phone);
 }
 printf("===============================================================\n");
}




int DelContact(CONTACT cons[],int num)
{
 int i = 1;
 showContact(cons,num);
 printf("请输入要删除的联系人序号:");
 scanf("%d",&i);
 if(i < 1 || i > num)
 printf("序号输入错误，删除失败！\n");
 else
 {
 for(int j = i ; j < num; j++)
 {
 cons[j] = cons[j
  + 1];
 }
 printf("联系人信息已删除！\n");
 num--;
 }
 return num;
}


void findContact(CONTACT cons[],int num)
{
 char f_name[25];
 int count = 0;
 int i = 1;
 printf("请输入要查找的联系人姓名:");
 scanf("%s",f_name);
 printf("===============================================================\n");
 printf("No.\t\t姓名\t\tQQ号\t\t联系电话\n");
 printf("---------------------------------------------------------------\n");
 for(i ; i <= num; i++)
 {
 if(strcmp(cons[i].name,f_name) == 0)
 {
  count++;
  printf("%d\t\t%s\t\t%s\t%s\t\t\n", i, cons[i].name, cons[i].QQ, cons[i].phone);
 }
 }
 printf("===============================================================\n");
 printf("共查询到%d条联系人数据\n",count);
}


void alterContact(CONTACT cons[], int num)
{
 int i;
 printf("请输入要修改的联系人序号：");
 scanf("%d", &i);
 if(i < 1 || i > num)
 {
 printf("序号输入有误，请重新输入！\n");
 alterContact(cons, num);
 }
 else
 {
 printf("请输入姓名(最长20个字符)：");
 scanf("%s",&cons[i].name);
 printf("请输入QQ(最长20位)：");
 scanf("%s",&cons[i].QQ);
 printf("请输入手机号码（最长20位）：");
 scanf("%s",&cons[i].phone);
 }
}


int main()
{
 CONTACT cons[100];
 int num = 0;
 int op = -1;
 while(1){
 int op;
 printf("\t*****菜单*****\t\n");
 printf("------------------------------\n");
 printf("\t1.添加联系人\n");
 printf("\t2.删除联系人\n");
 printf("\t3.显示所有联系人\n");
 printf("\t4.查找联系人\n");
 printf("\t5.修改联系人\n");
 printf("\t0.退出系统\n");
 printf("------------------------------\n");
 printf("请输入您的选择(0 ~ 5)：");
 scanf("%d",&op);
 if(op == 0)
  break;
 switch(op){
  case 1:
  num = AddContact(cons,num);
  break;
  case 2:
  num = DelContact(cons,num);
  break;
  case 3:
  showContact(cons,num);
  break;
  case 4:
  findContact(cons,num);
  break;
  case 5:
  showContact(cons, num);
  alterContact(cons,num);
  printf("修改成功！\n”);
  break;
 }
 }
 return 0;
}