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Practical-Teaching/OPP-in-C++/11/1.cpp

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+// 实现电话簿管理程序， Mytel类描述单个电话号码，TelManager类负责管理电话号码。把增、删、改、查功能封装到该类中。要求电话号码能从磁盘读写。
+
+#include <bits/stdc++.h>
+
+using namespace std;
+
+class Mytel {
+public:
+	void getdata() { cin >> name >> telno; }
+	void setname(char a[]) { strcpy(name, a); }
+	void settelno(char a[]) { strcpy(telno, a); }
+	void putdata() { cout << name << setw(12) << telno << endl; }
+	string getname() { return name; }
+	string gettelno() { return telno; }
+
+private:
+	char name[12];
+	char telno[12];
+};
+
+class TelManager {
+private:
+	vector<Mytel> a;
+
+public:
+	void loadfile() {
+		ifstream input("phone.txt");
+		if (!input) {
+			cout << "File cannot be opened." << endl;
+			return;
+		}
+		Mytel s;
+		char name[12], telno[12];
+		input >> name >> telno;
+		s.setname(name);
+		s.settelno(telno);
+		while (input) {
+			a.push_back(s);
+			input >> name >> telno;
+			s.setname(name);
+			s.settelno(telno);
+		};
+		input.close();
+	}
+	void display() {
+		cout << "姓名" << setw(8) << "电话" << endl;
+		for (int i = 0; i < a.size(); i++)
+			cout << a[i].getname() << setw(12) << a[i].gettelno() << endl;
+	}
+	void search() {
+		string sname;
+		cout << "输入要查询的姓名（可只输入姓氏）:";
+		cin >> sname;
+		cout << "输出查询结果:" << endl;
+		cout << "姓名" << setw(8) << "电话" << endl;
+		for (int i = 0; i < a.size(); i++)
+			if (a[i].getname() == sname)
+				a[i].putdata();
+	}
+	void add() {
+		Mytel one;
+		cout << "姓名" << setw(8) << "电话" << endl;
+		one.getdata();
+		a.push_back(one);
+	}
+	void del() {
+		string dname;
+		cout << "输入要删除的姓名（可只输入姓氏）:";
+		cin >> dname;
+		for (int i = 0; i < a.size(); i++)
+			if (a[i].getname() == dname)
+				a.erase(a.begin() + i);
+	}
+	void modify() {
+		string mname;
+		char mtelno[12];
+		cout << "输入要修改的姓名（可只输入姓氏）:";
+		cin >> mname;
+		for (int i = 0; i < a.size(); i++)
+			if (a[i].getname() == mname) {
+				cout << "电话：";
+				cin >> mtelno;
+				a[i].settelno(mtelno);
+			}
+	}
+	void writefile() {
+		ofstream file("phone.txt");
+		for (int i = 0; i < a.size(); i++)
+			file << a[i].getname() << "\t" << a[i].gettelno() << endl;
+		file.close();
+	}
+};
+
+int main() {
+	int sel;
+	TelManager m;
+	while (1) {
+		cout << "***********************电话薄管理系统***********************";
+		cout << endl
+			 << endl;
+		cout << "1:加载数据      2:输出数据      3:按姓名查询      4:添加数据" << endl
+			 << "5:删除数据      6:修改数据      7.保存数据        0:退出" << endl;
+		cout << "************************************************************";
+		cout << "\n请选择 (0 - 7): ";
+		cin >> sel;
+		switch (sel) {
+		case 1:
+			m.loadfile();
+			break;
+		case 2:
+			m.display();
+			break;
+		case 3:
+			m.search();
+			break;
+		case 4:
+			m.add();
+			break;
+		case 5:
+			m.del();
+			break;
+		case 6:
+			m.modify();
+			break;
+		case 7:
+			m.writefile();
+			break;
+		case 0:
+			exit(1);
+		}
+	}
+	return 0;
+}