动态版通讯录，小白看一眼就学会！

#define _CRT_SECURE_NO_WARNINGS
#include<iostream>
#include<cstring>
#include<iomanip>
#include<cstdlib>

using namespace std;
//全局变量
#define MAX_NAME 20
#define MAX_GENDER 10
#define MAX_ADDR 30
#define MAX_TEL 12
#define MAX_NUM 1000
#define SM 3
#define INC 2

typedef struct peoinfo {//定义联系人
	char name[MAX_NAME];
	int age;
	char gender[MAX_GENDER];
	char tel[MAX_TEL];
	char addr[MAX_ADDR];
}peoinfo;

typedef struct contact {//定义通讯录
	peoinfo* data;
	int capacity;
	int sz;
}contact;

void menu()//功能菜单
{
	cout << "********************************" << endl;
	cout << "********1.add      2.del********" << endl;
	cout << "********3.search   4.modify*****" << endl;
	cout << "********5.sort     6.print******" << endl;
	cout << "********0.exit     *************" << endl;
}
int search(contact* pc, char name[])//findbyname
{
	int i = 0;
	for (i = 0; i < pc->sz; i++)
	{
		if (strcmp(pc->data[i].name, name) == 0)
		{
			return i;
		}

	}
	return -1;
}


enum option//枚举
{
	EXIT, ADD, DEL, SEARCH, MODIFY, SORT, PRINT
};

void Initcontact(contact* pc)//初始化通讯录
{
	pc->data = (peoinfo*)malloc(SM* sizeof(peoinfo));
	if (pc->data == NULL)
	{
		perror("Initcontact");
		return;
	}
	pc->sz = 0;
	pc->capacity = SM;
}

void destorycontact(contact* pc)//释放调用空间
{
	free(pc->data);
	pc->data = NULL;
	pc->sz = 0;
	pc->capacity = 0;
}
void addcontact(contact* pc)//动态版增容
{
	if (pc->sz == pc->capacity)
	{
		peoinfo*ptr=(peoinfo*)realloc(pc->data, (INC + pc->capacity) * sizeof(peoinfo));
		if (ptr != NULL)
		{
			pc->data = ptr;
			cout << "增容成功！" << endl;
		    pc->capacity += INC;

		}
		else
		{
			perror("addcontact");
			return;
		}
		
	}
	else
	{
		cout << "请输入名字：" << endl;
		cin >> pc->data[pc->sz].name;
		cout << "请输入年龄：" << endl;
		cin >> pc->data[pc->sz].age;
		cout << "请输入性别：" << endl;
		cin >> pc->data[pc->sz].gender;
		cout << "请输入电话：" << endl;
		cin >> pc->data[pc->sz].tel;
		cout << "请输入地址：" << endl;
		cin >> pc->data[pc->sz].addr;
		cout << "添加成功" << endl;
		pc->sz++;
	}
}
void print(const contact* pc)//PEINT
{
	cout << left << setw(12) << setfill(' ') << "名字" << left << setw(12) << setfill(' ') << "年龄" << left << setw(12) << setfill(' ') << "性别" << left << setw(12) << setfill(' ') << "电话" << left << setw(12) << setfill(' ') << "地址" << endl;
	for (int i = 0; i < pc->sz; i++)
	{
		cout << left << setw(12) << setfill(' ') << pc->data[i].name;
		cout << left << setw(12) << setfill(' ') << pc->data[i].age;
		cout << left << setw(12) << setfill(' ') << pc->data[i].gender;
		cout << left << setw(12) << setfill(' ') << pc->data[i].tel;
		cout << left << setw(12) << setfill(' ') << pc->data[i].addr << endl;
	}
	cout << "打印成功" << endl;
}
void delcontact(contact* pc)//DEL
{
	char name[MAX_NAME];
	if (pc->sz == 0)
	{
		cout << "通讯录为空，无需删除" << endl;
		return;
	}
	cout << "请输入你要删除的联系人名字：";
	cin >> name;
	int pos = search(pc, name);

	if (pos == -1)
	{
		cout << "要删除的联系人不存在" << endl;
		return;
	}

	for (int i = pos; i < pc->sz - 1; i++)
	{
		pc->data[i] = pc->data[i + 1];
	}
	pc->sz--;
	cout << "删除成功" << endl;
}
void searchcontact(contact* pc)//SEARCH
{
	char name[MAX_NAME];
	cout << "请输入你要查找的联系人名字：";
	cin >> name;
	int pos = search(pc, name);

	if (pos == -1)
	{
		cout << "要查找的联系人不存在" << endl;
		return;
	}
	else
	{
		cout << left << setw(12) << setfill(' ') << "名字" << left << setw(12) << setfill(' ') << "年龄" << left << setw(12) << setfill(' ') << "性别" << left << setw(12) << setfill(' ') << "电话" << left << setw(12) << setfill(' ') << "地址" << endl;
		cout << left << setw(12) << setfill(' ') << pc->data[pos].name;
		cout << left << setw(12) << setfill(' ') << pc->data[pos].age;
		cout << left << setw(12) << setfill(' ') << pc->data[pos].gender;
		cout << left << setw(12) << setfill(' ') << pc->data[pos].tel;
		cout << left << setw(12) << setfill(' ') << pc->data[pos].addr << endl;
		cout << "查找成功" << endl;
	}

}
void modifycontact(contact* pc)//MODOFY
{
	char name[MAX_NAME];
	cout << "请输入你要修改的联系人名字：";
	cin >> name;
	int pos = search(pc, name);

	if (pos == -1)
	{
		cout << "要修改的联系人不存在" << endl;
		return;
	}
	else
	{
		cout << "请输入名字：" << endl;
		cin >> pc->data[pos].name;
		cout << "请输入年龄：" << endl;
		cin >> pc->data[pos].age;
		cout << "请输入性别：" << endl;
		cin >> pc->data[pos].gender;
		cout << "请输入电话：" << endl;
		cin >> pc->data[pos].tel;
		cout << "请输入地址：" << endl;
		cin >> pc->data[pos].addr;
		cout << "修改成功" << endl;
	}

}

void sortcontact(contact* pc) //SORT
{
	for (int i = 0; i < pc->sz - 1; i++) {
		for (int j = 0; j < pc->sz - i - 1; j++) {
			if (strcmp(pc->data[j].name, pc->data[j + 1].name) > 0) {
				peoinfo temp = pc->data[j];
				pc->data[j] = pc->data[j + 1];
				pc->data[j + 1] = temp;
			}
		}
	}
	cout << "排序完成" << endl;
}
int main()//主函数
{
	int input = 0;
	contact con;
	Initcontact(&con);

	do {
		menu();
		cout << "请选择:->" << endl;
		cin >> input;
		switch (input)
		{
		case ADD://增加联系人
			addcontact(&con);
			break;
		case DEL://删除联系人
			delcontact(&con);
			break;
		case SEARCH://查询联系人
			searchcontact(&con);
			break;
		case MODIFY://修改联系人
			modifycontact(&con);
			break;
		case SORT://排序联系人
			sortcontact(&con);
			break;
		case PRINT://打印联系人
			print(&con);
			break;
		case EXIT:
			cout << "退出通讯录" << endl;
			destorycontact(&con);
			break;
		default:
			cout << "选择错误，请重新选择！" << endl;
			break;
		}

	} while (input);
	return 0;

}