In classful addressing the class of the address can be found by shifting the copy of the address bits to the right?

Shifting to the right won't accomplish anything. To find the class of the address, look at the first octet in the address. You can either look for the range of addresses for a class, or look at the first 3 bits in the first octet:

First octetAddress Class0-127Class A128-191Class B192-223Class C224-239Class D240-255Class E

0nnnnnnn. First octet class A range (first bit is 0)

10nnnnnn. First octet class B range (first bits are 10)

110nnnnn. First octet class C range (first bits are 110)

It is easiest just to look at the range.