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作业目标#xff1a;
这个作业中#xff0c;你需要综合运用之前文章中的知识#xff0c;来解决一个相对完整的应用程序。
作业描述#xff1a;
1 在这个作业中你需要在文本文件中存储学生通讯录的信息#xff0c;并在程序启动的时候加载这些…C自学精简教程 目录(必读)
作业目标
这个作业中你需要综合运用之前文章中的知识来解决一个相对完整的应用程序。
作业描述
1 在这个作业中你需要在文本文件中存储学生通讯录的信息并在程序启动的时候加载这些数据到内存中。
2 在程序运行过程中允许用户用键盘输入信息来完成对通讯录数的增删改查。
交互示例 开始代码
开始代码不是完整的代码需要你填写一部分代码使之完整。
答案在本文最后。
当你填写完整之后运行程序和示例的交互输出一致就算完成了这个作业
开始代码
#include iostream
#include iostream
#include iomanip
#include string
#include vector
#include fstream
using namespace std;class Person
{
public:friend ostream operator(ostream os, const Person _person);friend istream operator(istream is, Person _person);public:string m_id;string m_name;string m_tel;
};ostream operator(ostream os, const Person person)
{os left setw(5) person.m_id setw(15) person.m_name setw(20) person.m_tel;return os;
}istream operator(istream is, Person person)
{//(1) your code // 使用输入操作符重载将流中的数据提取赋值给person对象的成员变量中//see https://zhuanlan.zhihu.com/p/412724745return is;
}class PersonManager
{
public:void InputOnePerson(void);bool LoadAllPersonFromFile(const string fileName);bool DeletePerson(void);bool QueryPersonByName() const;bool QueryPersonByTel() const;void ShowAllPerson(void) const;bool SaveAllPersonToFile(void) const;private:vectorPerson m_allPerson;
};bool PersonManager::DeletePerson(void)
{cout Please input person id for delete:;string id;cin id;for (auto itr m_allPerson.begin(); itr ! m_allPerson.cend(); itr){if (itr-m_id id){//(2) your code// 容器的erase方法支持删除容器的元素时传入指向元素的迭代器//see https://zhuanlan.zhihu.com/p/441293600}}return false;
}
bool PersonManager::QueryPersonByName() const
{//注意该函数需要返回bool值cout Please input name for query:;string name;cin name;for (auto itr m_allPerson.cbegin(); itr ! m_allPerson.cend(); itr){if (itr-m_name name){cout Find: endl;//(3) your code//see https://zhuanlan.zhihu.com/p/376440190//see https://zhuanlan.zhihu.com/p/376446724}}cout not found name endl;return false;
}
bool PersonManager::QueryPersonByTel() const
{cout Please input tel for query:;string tel;cin tel;for (auto itr m_allPerson.cbegin(); itr ! m_allPerson.cend(); itr){if (itr-m_tel tel){cout Find: endl;//(4) your code//see https://zhuanlan.zhihu.com/p/376440190//see https://zhuanlan.zhihu.com/p/376446724}}cout not found tel endl;return false;
}void PersonManager::ShowAllPerson(void) const
{cout All Person: endl;cout left setw(5) id setw(15) name setw(20) tel endl;for (auto item : m_allPerson){cout item endl;}
}
bool PersonManager::SaveAllPersonToFile(void) const
{ofstream fout(data_saved.txt);//下面的常量迭代器 cbegin cend 中的 c 指的是 const的意思表示不可以修改容器的元素for (auto itr m_allPerson.cbegin(); itr ! m_allPerson.cend(); itr){//(5) your code //see https://zhuanlan.zhihu.com/p/262508774}return true;
}bool PersonManager::LoadAllPersonFromFile(const string fileName)
{ifstream fin(fileName);if (!fin){cout load data failed . file fileName not exits. endl;return false;}Person person;while (fin person){m_allPerson.push_back(person);}cout load data from file success. endl;return true;
}void PersonManager::InputOnePerson(void)
{cout Please input one person endl;cout Please input id;string id;cin id;Person person;person.m_id id;for (auto itr m_allPerson.cbegin(); itr ! m_allPerson.cend(); itr){if (itr-m_id id){cout id already existed! Save failed. endl;return;}}cout Please input name;string name;cin name;person.m_name name;cout Please input tel;string tel;cin tel;person.m_tel tel;cout Input finished, save successed. endl;m_allPerson.push_back(person);
}int main(int argv, char* argc[])
{PersonManager personMgr;personMgr.LoadAllPersonFromFile(input_data.txt);personMgr.ShowAllPerson();while(true){coutinput a commond : endl;cout1 [AddPerson]endl;cout2 [ShowAllPerson]endl;cout3 [QueryPerson by name]endl;cout4 [QueryPerson by tel]endl;cout5 [SaveAllPersonToFile]endl;cout6 [DeletePerson]endl;cout0 [ExitAndSaveChange]endl;int commond;cincommond;switch(commond){case 1: { personMgr.InputOnePerson(); break;}case 2: { personMgr.ShowAllPerson(); break;}case 3: { personMgr.QueryPersonByName(); break;}case 4: { personMgr.QueryPersonByTel(); break;}case 5: { personMgr.SaveAllPersonToFile(); break;}case 6: { personMgr.DeletePerson(); break;}case 0: { personMgr.SaveAllPersonToFile(); return 0;}default:{ coutSystem Exit.endl; return 0;}}}return 0;
}输入文件
input_data.txt
文件内容
2 zhangsan2 13788889992
3 zhangsan3 13788889993
4 zhangsan4 13788889994
5 wanger 13333333333
运行与输出
load data from file success.
All Person:
id name tel
2 zhangsan2 13788889992
3 zhangsan3 13788889993
4 zhangsan4 13788889994
5 wanger 13333333333
input a commond :
1 [AddPerson]
2 [ShowAllPerson]
3 [QueryPerson by name]
4 [QueryPerson by tel]
5 [SaveAllPersonToFile]
6 [DeletePerson]
0 [ExitAndSaveChange]
2
All Person:
id name tel
2 zhangsan2 13788889992
3 zhangsan3 13788889993
4 zhangsan4 13788889994
5 wanger 13333333333
input a commond :
1 [AddPerson]
2 [ShowAllPerson]
3 [QueryPerson by name]
4 [QueryPerson by tel]
5 [SaveAllPersonToFile]
6 [DeletePerson]
0 [ExitAndSaveChange]
1
Please input one person
Please input id1
Please input namezhangsan
Please input tel13344445555
Input finished, save successed.
input a commond :
1 [AddPerson]
2 [ShowAllPerson]
3 [QueryPerson by name]
4 [QueryPerson by tel]
5 [SaveAllPersonToFile]
6 [DeletePerson]
0 [ExitAndSaveChange]
2
All Person:
id name tel
2 zhangsan2 13788889992
3 zhangsan3 13788889993
4 zhangsan4 13788889994
5 wanger 13333333333
1 zhangsan 13344445555
input a commond :
1 [AddPerson]
2 [ShowAllPerson]
3 [QueryPerson by name]
4 [QueryPerson by tel]
5 [SaveAllPersonToFile]
6 [DeletePerson]
0 [ExitAndSaveChange]
3
Please input name for query:zhangsan
Find:
1 zhangsan 13344445555
input a commond :
1 [AddPerson]
2 [ShowAllPerson]
3 [QueryPerson by name]
4 [QueryPerson by tel]
5 [SaveAllPersonToFile]
6 [DeletePerson]
0 [ExitAndSaveChange]
3
Please input name for query:zhang
not found zhang
input a commond :
1 [AddPerson]
2 [ShowAllPerson]
3 [QueryPerson by name]
4 [QueryPerson by tel]
5 [SaveAllPersonToFile]
6 [DeletePerson]
0 [ExitAndSaveChange]
4
Please input tel for query:13344445555
Find:
1 zhangsan 13344445555
input a commond :
1 [AddPerson]
2 [ShowAllPerson]
3 [QueryPerson by name]
4 [QueryPerson by tel]
5 [SaveAllPersonToFile]
6 [DeletePerson]
0 [ExitAndSaveChange]
4
Please input tel for query:1334444
not found 1334444
input a commond :
1 [AddPerson]
2 [ShowAllPerson]
3 [QueryPerson by name]
4 [QueryPerson by tel]
5 [SaveAllPersonToFile]
6 [DeletePerson]
0 [ExitAndSaveChange]
6
Please input person id for delete:4
input a commond :
1 [AddPerson]
2 [ShowAllPerson]
3 [QueryPerson by name]
4 [QueryPerson by tel]
5 [SaveAllPersonToFile]
6 [DeletePerson]
0 [ExitAndSaveChange]
2
All Person:
id name tel
2 zhangsan2 13788889992
3 zhangsan3 13788889993
5 wanger 13333333333
1 zhangsan 13344445555
input a commond :
1 [AddPerson]
2 [ShowAllPerson]
3 [QueryPerson by name]
4 [QueryPerson by tel]
5 [SaveAllPersonToFile]
6 [DeletePerson]
0 [ExitAndSaveChange]
5
input a commond :
1 [AddPerson]
2 [ShowAllPerson]
3 [QueryPerson by name]
4 [QueryPerson by tel]
5 [SaveAllPersonToFile]
6 [DeletePerson]
0 [ExitAndSaveChange]
0
最终保存数据到文件 data_saved.txt
文件 data_saved.txt 的内容为
2 zhangsan2 13788889992
3 zhangsan3 13788889993
5 wanger 13333333333
1 zhangsan 13344445555
你的结果也是这样吗
答案在此
C自学精简教程 全部答案 学生完成该作业展示 另一个学生实现的效果
