#include<fstream.h>
#include<string.h>
#include<stdlib.h>


int main()
{
    struct student{
        int num;
        char na[10];
         int tel;
        int de;
    }stu[]={1,"licaix",1322,205,
            2,"xumin",1322,205,
            3,"dingxiao",13222,205};
    ofstream ofp("stu.dat",ios::binary);
    if(!ofp){
        cerr<<"can't open stu.dat!"<<endl;
        abort();
    }
    int i;
    for(i=0;i<=2;i++)
          ofp.write((char*)&stu[i],sizeof(student));
    student newstu={4,"huangmin",13222,205};
          ofp.write((char*)&newstu,sizeof(student));
    student xiugai={2,"xumin",132226,206};
         ofp.seekp(sizeof(student));
         ofp.write((char*)&xiugai,sizeof(student));
    ofp.close();

   fstream fp("stu.dat",ios::binary);
    if(!fp){
        cerr<<"can't open stu.dat!"<<endl;
        abort();
    }
    student st[4];
        fp.read((char*)&st[i],sizeof(student));
    for(i=0;i<4;i++)
        cout<<st[i].num<<""<<st[i].na<<""<<st[i].tel<<""<<st[i].de<<endl;
        fp.close();
return 0;
}
程序为什么运行结果是student。dat打不开啊？