#include<iostream.h> 
#include<fstream.h> 
#include<iomanip.h> 
static int n=0; 
int comp(char*,char*); 
class MyFriend 
{ 
unsigned int age; 
char name[12]; 
char TelNo[12]; 
public: 
void getdata() 
{ 
cout<<"(年齡 姓名 電話):"; 
cin>>age>>name>>TelNo; 
} 
void disp() 
{ 
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<<"輸入數(shù)據(jù)"<<endl; 
cout<<"我的朋友人數(shù):"; 
cin>>n; 
for(int i=0;i<n;i++) 
{ 
cout<<"第"<<i+1<<"個我的朋友"; 
s.getdata(); 
output.write((char *)&s,sizeof(s)); 
}; 
output.close(); 
} 
void func2() 
{ 
ifstream input("MyFrd.dat"); 
MyFriend s; 
cout<<"輸入數(shù)據(jù)"<<endl; 
cout<<setiosflags(ios::left) 
<<setw(6)<<"年齡"<<setw(10)<<"姓名"<<setw(7)<<"電話"<<endl; 
input.read((char *)&s,sizeof(s)); 
while(input) 
{ 
s.disp(); 
input.read((char*)&s,sizeof(s)); 
}; 
input.close(); 
} 
void func3() 
{ 
char sname[10]; 
fstream file("MyFrd.dat",ios::in); 
MyFriend one; 
file.seekg(0); 
cout<<"輸入要查詢的姓名（可只輸入姓氏）:"; 
cin>>sname; 
cout<<"輸出查詢結(jié)果:"<<endl; 
cout<<setw(6)<<"年齡"<<setw(10)<<"姓名"<<setw(6)<<"電話"<<endl; 
for(int i=0;i<n;i++) 
{ 
file.read((char *)&one,sizeof(MyFriend)); 
if(comp(one.getname(),sname)==1) 
one.disp(); 
} 
file.close(); 
} 
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<<"選擇（1:輸入數(shù)據(jù) 2：輸出數(shù)據(jù) 3:按姓名查詢 其它退出）："; 
cin>>sel; 
switch(sel) 
{ 
case 1:func1();break; 
case 2:func2();break; 
case 3:func3();break; 
} 
}while(sel==1||sel==2||sel==3); 
}