cpp1.cpp

学生管理系统 学生管理系统 学生管理系统

#include <iostream.h>
#include <fstream.h>
#include <iomanip.h>
static int n=0;
int comp(char*,char*);
class MyFriend
{
	char tag;
	unsigned int age;
	char name[12];
	char TelNo[12];
public:
	int getMyFriendNo()
	{
		return age;
	}
	void getdata()
	{
		tag='#';
        cout<<"(年龄  姓名   电话):";
		cin>>age>>name>>TelNo;
	}
	char gettag()
	{
		return tag;
	}
	void disp()
	{
		if(tag=='#')
			cout<<setiosflags(ios::left)
			<<setw(6)<<age<<setw(10)<<name<<setw(7)<<TelNo<<endl;
	}
	char *getname()
	{
		return name;
	}
};
void func1()
{
	ofstream output("MyFrd.dat");
	MyFriend s;
	cout<<"输入数据"<<endl;
	cout<<"我的朋友人数:";
	cin>>n;
	for (int   i=0; i<n;i++)
	{
		cout<<"第"<<i+1<<"个我的朋友";
		s.getdata();
		output.write((char  *)&s,sizeof(s));
	}
	output.close();
}
void func2()
{
	ifstream  input("MyFrd.dat");
    MyFriend s;
	cout<<"输入数据:"<<endl;
	cout<<setiosflags(ios::left)
		<<setw(6)<<"年龄"<<setw(10)<<"姓名"<<setw(7)<<"电话"<<endl;
	input.read((char *)&s, sizeof(s));
	while(input)
	{
		s.disp();
		input.read((char*)&s,sizeof(s));


};
input.close();
}
void func3()
{
	char sname[10];
	ifstream file("MyFrd.dat");
    MyFriend one;
	file.seekg(0);
	cout<<"输入要查询的姓名（可输入姓氏）:";
	cin>>sname;
	cout<<"输出查询结果:"<<endl;
	cout<<setw(6)<<"年龄"<<setw(10)<<"姓名"<<setw(6)<<"电话"<<endl;
	file.read((char *)&one,sizeof(one));
	while (file)
	{ 
		if(comp(one.getname(),sname)==1)
			one.disp();
		file.read((char*)&one,sizeof(one));
	};
	file.close();
}
void func4()
{ 
	fstream outapp("MyFrd.dat",ios::app);
	MyFriend one;
	cout<<"添加数据:";
	one.getdata();
	outapp.write((char*)&one,sizeof(one));
	outapp.close();
}
void func5()
{
	char sname[12];
	int i=0;
	fstream outdel("MyFrd.dat",ios::in|ios::out);
	MyFriend one ;
	outdel.seekg(0);
	cout<<"输入要删除的姓名(可只输入姓氏):";
	cin>>sname;
	while(!outdel.eof())
	{
		outdel.seekp(sizeof(MyFriend)*i);
		outdel.read((char*)&one,sizeof(one));    
		if (comp(one.getname(),sname)==1 && one.gettag()=='#')
		 {
	         outdel.seekp(sizeof(MyFriend)*i);
	         outdel.put('*');
		 }
         i++;
     }
	 outdel.close();
}
void func6()
 {
	 fstream outdel("myfrd.dat",ios::in);
	 fstream temp("temp",ios::out|ios::trunc);
	 MyFriend s;
	 while(!outdel.eof())
	 {
		  outdel.read((char *)&s,sizeof(MyFriend));
		  if (s.gettag()=='#')
			    temp.write((char *)&s,sizeof(MyFriend));
	 }
	   outdel.close();
	   temp.close();
	   fstream outdel1("MyFrd",ios::out|ios::trunc);
	   fstream temp1("temp",ios::in);
	   while (!temp1.eof())
	   {
		   temp1.read((char *)&s,sizeof(MyFriend));
		   outdel1.write((char *)&s,sizeof(MyFriend));
	   }
	   outdel1.close();
	   temp1.close();
	   cout<<"此记录已物理删除"<<endl;
 }
 int comp(char s1[],char s2[])
 {
	 int i=0;
	 while (s1[i]!='\0' && s2[i]!='\0' && s1[i]==s2[i])
		 i++;
	 if(s1[i]=='\0' || s2[i]=='\0')
		 return 1;
	 else
		 return 0;
 }
 void main()
 {
	 int sel;
	 do 
	 {
		 cout<<"请选择(1:输入数据 2:输出数据 3:按姓名查询"<<endl
		 <<"4:添加数据 5:逻辑删除 6:物理删除 其它退出):";
		 cin>>sel;
		 switch(sel)
		 {
		 case 1:func1();break;
		 case 2:func2();break;
		 case 3:func3();break;
		 case 4:func4();break;
		 case 5:func5();break;
		 case 6:func6();break;
		 }
	 }while(sel>=1 && sel<=6);
 }