DCS viva help

sir(or ma'm),one of my friends was asked to design a combinational ckt that squares the value of input given.what general strategy should be followed to answer such questions within 2 min.kindly give example of some other similar question.thankyou

 

Got your IEEE membership yet? Here's a method - http://ieeexplore.ieee.org/Xplore/login.jsp?url=/iel4/4/16032/00743786.pdf?arnumber=743786.

 

See page 31: http://www.national.com/an/AN/AN-31.pdf

 

I think he wants a digital solution (he said combinational circuit).

 

Never mind the reference then.

 

i just wanna know how to mentally design a combination ckt that squares(or divides or perform any such operation).& it's 'she'.