FILE *fp;
    fp = fopen("Records.txt","r");
    cout<<"Category     ID     Name     Author     Quantity     Price     Racknn";
    while(fread(&b,sizeof(b),1,fp)==1){
        cout<<b.category<<"     "<<b.id<<"     "<<b.name<<"     "<<b.author<<"     "<<b.quantity<<"     "<<b.price<<"     "<<b.rackno;
        cout<<endl<<endl;
    }
    fclose(fp);