主要用到的知识点
动态开辟内存，根据用户需要创建通讯录大小练习结构体的声明定义使用熟悉指针传参的过程，提高鲁棒性add_list.h
#pragma once #define _CRT_SECURE_NO_WARNINGS #define NAME 20 #define PHONE 20 #define ADDRESS 50 struct Person { char name[NAME]; char sex; int age; char phoneNum[PHONE]; char address[ADDRESS]; char flag; //标记，=1表示人被删除 }*ppsn; void add_person(struct Person * ppsn); //增加一个人 void del_person(struct Person * ppsn); //删除指定人 void find_person(struct Person * ppsn); //寻找指定人 void update(struct Person * ppsn); //更新人信息 void show_all(struct Person * ppsn); //显示所有人 void clear(); //清空所有人 void sort_by_name(struct Person * ppsn); //按名排序 void init(int size); //初始化test.c
#include "add_list.h" #include <stdio.h> void menu() { printf("**************************************\n"); printf("********中华老字号--通讯小助手********\n"); printf("********1.添加联系人信息 *************\n"); printf("********2.删除联系人信息 *************\n"); printf("********3.查找联系人信息 *************\n"); printf("********4.修改联系人信息 *************\n"); printf("********5.显示所有指定联系人信息******\n"); printf("********6.清空所有指定联系人信息******\n"); printf("********7.按名排序所有联系人**********\n"); printf("********0.退出************************\n"); printf("**************************************\n"); } int main() { printf("请选择你想创建的通讯录大小\n"); int sizeOfAdd; scanf("%d", &sizeOfAdd); init(sizeOfAdd); int chose; do { menu(); scanf("%d", &chose); switch (chose) { case 1:add_person(ppsn); break; case 2:del_person(ppsn); break; case 3:find_person(ppsn); break; case 4:update(ppsn); break; case 5:show_all(ppsn); break; case 6:clear(ppsn); break; case 7:sort_by_name(ppsn); break; default:break; } } while (chose); system("pause"); }add_list.c
#include "add_list.h" #include <stdio.h> #include <stdlib.h> //通讯录目前总人数 int sumCount = 0; //动态开辟的大小 int sizeOfAdd = 0; void init(int size) { sizeOfAdd = size; ppsn = NULL; ppsn = (struct Person *)malloc(size * sizeof(struct Person)); } void clear() { free(ppsn); ppsn = (struct Person *)malloc(sizeOfAdd * sizeof(struct Person)); if (ppsn == NULL) { printf("清空失败"); } } void add_person(struct Person * ppsn) { ppsn += sumCount; if (ppsn != NULL) { printf("请依次输入姓名 性别 年龄 电话 地址，中间用空格隔开\n"); scanf("%s %c %d %s %s", ppsn->name, &ppsn->sex, &ppsn->age, ppsn->phoneNum, ppsn->address); ppsn->flag = 0; sumCount += 1; } } void del_person(struct Person * ppsn) { char name[NAME]; printf("请输入删除人的姓名\n"); scanf("%s", name); if (ppsn == NULL) { return; } int count = sumCount; for (; ppsn != NULL&&count; count--, ppsn++) { if (strcmp(ppsn->name, name) == 0 && !(ppsn->flag)) { printf("已经删除 %s %c %d %s %s\n", ppsn->name, ppsn->sex, ppsn->age, ppsn->phoneNum, ppsn->address); ppsn->flag = 1; return; } } } void show_all(struct Person * ppsn) { int count = sumCount; while (ppsn != NULL && count--) { if(!(ppsn->flag)) printf("%s %c %d %s %s\n", ppsn->name, ppsn->sex, ppsn->age, ppsn->phoneNum, ppsn->address); ppsn++; } } int cmp(const void *a, const void *b) { struct Person *pa = (struct Person *)a; struct Person *pb = (struct Person *)b; return strcmp(pa->name, pb->name); } void sort_by_name(struct Person * ppsn) { if (ppsn == NULL) { return; } qsort(ppsn, sumCount, sizeof(struct Person), cmp); } void find_person(struct Person * ppsn) { char name[NAME]; printf("请输入删除人的姓名\n"); scanf("%s", name); if (NULL == name || ppsn == NULL) { return; } int count = sumCount; for (; ppsn != NULL && count; count--,ppsn++) { if (strcmp(ppsn->name, name) == 0 && !(ppsn->flag)) { printf("%s %c %d %s %s\n", ppsn->name, ppsn->sex, ppsn->age, ppsn->phoneNum, ppsn->address); return; } } printf("没有找到\n"); } void update(struct Person * ppsn) { char name[NAME]; printf("请输入删除人的姓名\n"); scanf("%s", name); if (NULL == name || ppsn == NULL) { return; } int count = sumCount; for (; ppsn != NULL && count; count--, ppsn++) { if (strcmp(ppsn->name, name) == 0 && !(ppsn->flag)) { printf("找到联系人，请依次输入姓名 性别 年龄 电话 地址，中间用空格隔开\n"); scanf("%s %c %d %s %s", ppsn->name, &ppsn->sex, &ppsn->age, ppsn->phoneNum, ppsn->address); return; } } printf("没有找到\n"); }