第七章第五题

#include <iostream>
#include <fstream>
using namespace std;
struct staff
{int num;
char name[20];
int age;
double  pay;
};
int main()
{staff staf[7]={3898,"Fan",34,1200,3899,"Wang",23,6740,2448,"Chen",54,778,
3000,"Du",45,4763,3301,"Ling",39,6555},staf1;
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<<staf[i].num<<" "<<staf[i].name<<" "<<staf[i].age<<" "<<staf[i].pay<<endl;
iofile.write((char *)&staf[i],sizeof(staf[i]));}
cout<<"please input data you want insert:"<<endl;
for(i=0;i<2;i++)
{cin>>staf1.num>>staf1.name>>staf1.age>>staf1.pay;
iofile.seekp(0,ios::end);
iofile.write((char *)&staf1,sizeof(staf1));}
iofile.seekg(0,ios::beg);
for(i=0;i<7;i++)
{iofile.read((char *)&staf[i],sizeof(staf[i]));
cout<<staf[i].num<<" "<<staf[i].name<<" "<<staf[i].age<<" "<<staf[i].pay<<endl;
}
bool find;
cout<<"enter number you want 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 *)&staf[i],sizeof(staf[i]));
if(num==staf[i].num)
{m=iofile.tellg();
cout<<num<<" is No."<<m/sizeof(staf1)<<endl;
cout<<staf[i].num<<" "<<staf[i].name<<" "<<staf[i].age<<" "<<staf[i].pay<<endl;
find=true;
break;
}
}
if(!find)
cout<<"can't find "<<num<<endl;
cout<<"enter number you want search,enter 0 to stop.";
cin>>num;
}
iofile.close();
return 0;
}