7-5

#include <iostream>
#include <fstream>
using namespace std;
struct staff
{
 int num;
 char name[10];
 int age;
 double pay;
};
int main()
{
	staff s[7]={1,"z",18,10000,3,"x",18,20000,2,"f",26,20000,4,"m",26,10000,5,"u",20,15000},s1;
    fstream iofile("staff.dat",ios::in|ios::out|ios::binary);
    if(!iofile)
	{
	 cerr<<"open error!"<<endl;
	 abort();
	}
	int i,m,num;
	cout<<"Five staff:"<<endl;
	for(i=0;i<5;i++)
	{
	 cout<<s[i].num<<" "<<s[i].name<<" "<<s[i].age<<" "<<s[i].pay<<endl;
	 iofile.write((char *)&s[i],sizeof(s[i]));
	}
	cout<<"Please insert two staff's message:"<<endl;
	for(i=0;i<2;i++)
	{cin>>s1.num>>s1.name>>s1.age>>s1.pay;
	iofile.seekp(0,ios::end);
	iofile.write((char *)&s1,sizeof(s1));}
	iofile.seekg(0,ios::beg);
	for(i=0;i<7;i++)
	{iofile.read((char *)&s[i],sizeof(s[i]));
	cout<<s[i].num<<" "<<s[i].name<<" "<<s[i].age<<" "<<s[i].pay<<endl;}
	bool find;
	cout<<"enter number you want to search,enter 0 to stop";
	cin>>num;
	while(num)
	{
	 find=false;
	 iofile.seekg(0,ios::beg);
	 for(i=0;i<7;i++)
	 {
	  iofile.read((char *)&s[i],sizeof(s[i]));
	  if(num==s[i].num)
	  {
	   m=iofile.tellg();
	   cout<<num<<"is NO."<<m/sizeof(s1)<<endl;
	   cout<<s[i].num<<" "<<s[i].name<<" "<<s[i].age<<" "<<s[i].pay<<endl;
	   find=true;
	   break;
	  }
	 }
	 if(!find)
		 cout<<"can't find!"<<num<<endl;
	 cout<<"please input again!";
	 cin>>num;
	}
	iofile.close();
	return 0;
}