header* meta = new header;
...
infile.read ((char*)meta, sizeof(header));
...

cout << " Header size: "<<sizeof(*meta)<<" bytes" << endl;
cout << " Sample Rate "<< meta->sample_rate <<" Hz" << endl;
cout << " Bits per samples: " << meta->bits_per_sample << " bit" <<endl;
cout << " Number of channels: " << meta->num_channels << endl;
cout << " Number of samples: " << numOfSample << endl;