#include
#include
#include
using namespace std;
int main(int argc, char *argv[])
{
fstream out("test.txt", ios::in | ios::out | ios::binary);
if(!out) {
cout << "Cannot open file.";
return 1;
}
out.seekp(12, ios::beg);
out.put('a');
out.close();
return 0;
}