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#include <iostream>
#include <fstream>
using namespace std;
int main()
{
fstream ostrm("d:\\test.txt",ios::binary|ios::trunc|ios::in|ios::out);
double a=3.5,b;
ostrm.write((const char *)&a,sizeof(a));
ostrm.seekg(0);
char buffer[8]={0};
ostrm.read(buffer,8);
cout<<*(double*)buffer<<endl;
return 0;
}