按照书上写的，编译无错误，但运行后应生成的文件没有生成，找不到，请各位高手帮忙

# include <fstream.h>
# include <iostream>struct Date
{
 int iMonth,iDay,iYear;
};
struct Product
{
 int iPartNumber;
 char szName[80];
 double dPrice;
};
struct Custom
{
 int iID;
 char szName[50];
 char szAddress[50];
 char szCity[20];
 char szState[20];
 char szZip[9];
};
void main()
{Date dt={6,10,92};
Product prod={122,"Vegamatic",19.95};
Customer cust={15,"David Rose","300 road","Newyork","USA","123456");
ofstream datafile("data.dat");
datafile.write((char*)&dt,sizeof dt);
datafile.write((char*)&prod,sizeof prod);
datafile.write((char*)&cust,sizeof cust);
}

使用ofstream应该不止这一个参数,你查下MSDN,我记得应该还有个ios::out,等等

书上写的是
ofstream datafile("data.dat",ios::binary);
但有没有ios::binary这句没什么区别，都无法生成

ios::binary是二进制格式.

Please try the following:

int main()
{Date dt={6,10,92};
Product prod={122,"Vegamatic",19.95};
Customer cust={15,"David Rose","300 road","Newyork","USA","123456");
ofstream datafile("data.dat",ios::binary);
datafile.write((char*)&dt,sizeof dt);
datafile.write((char*)&prod,sizeof prod);
datafile.write((char*)&cust,sizeof cust);
return 0;
}

1) because "void main()" can't be compiled in most compiler, it should be "int main()" and there is a "return 0;" if you use "int main()".
2) ofstream datafile("data.dat",ios::binary).