流类库7

#include<iostream>
#include<fstream>
using namespace std;
int main()
{
int values[]={3,7,0,5,4};
ofstream os("integers",ios_base::out | ios_base::binary);
os.write(reinterpret_cast<char *>(values),sizeof(values));
os.close();
ifstream is("integers",ios_base::Init | ios_base::binary);
if(is){
is.seekg(3*sizeof(int));
int v;
is.read(reinterpret_cast<char *>(&v),sizeof(int));
cout<<"The 4th integer in the file 'integers' is "<<v<<endl;
}else{
cout<<"ERROR:Cannot open file 'integers'."<<endl;
}
return 0;
}