请教一个文件操作的问题（打开时乱码或无法识别）

#include<iostream>
#include<fstream>
#include<cstdlib>
using namespace std;
struct student
{
char name[20]; int num; int age; char sex;
};
int main()
{
student stud[1]={"LI",1000,18,'f'};
ofstream outfile("stud.txt",ios::binary);
if(!outfile)
{
cerr<<"error "<<endl; exit(1);
}
outfile.write((char *)&stud[1],sizeof(stud[1]));
outfile.close();
return 0;
}