writing into binary file

I have a problem when i am writing into files in a binary format.I have noticed that, it writes two times into the file. Here i have attached the code.

Code:

class bank
{
protected:
char receive[20];
public:
}

int main()
{
fstream file;
strcpy(receive,"hello");
file.open("binary.my",ios_base::in | ios_base::out | ios_base::binary | ios_base::app);
file.write(reinterpret_cast(&receive),sizeof(receive));
file.close();
return 0;
}