#include
#include
#include
using namespace std;
int main(int argc, char *argv[])
{
if(argc != 3) {
cout << "Usage: CHANGE \n";
return 1;
}
fstream out(argv[1], ios::in | ios::out | ios::binary);
if(!out) {
cout << "Cannot open file.\n";
return 1;
}
out.seekp(atoi(argv[2]), ios::beg);
out.put('X');
out.close();
return 0;
}