7.5

#include <iostream> #include <fstream> using namespace std; typedef struct staff { int num;  char name[20];  int age;  double  pay; }; int main() { staff staf[7]={2101,"Li",34,1203,2104,"Wang",23,674.5,2108,"Fun",54,778,3006,"Xue",45,476.5,5101,"Ling",39,656.6},staf1;  fstream iofile("stu.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; }