optimal way to generate two complement of a number

[bh_letters]

Hi,

Which is an optimal way to generate two complement of a number using logic gates?

thanks

 

[echo47]

It sounds like you want to convert something to two's compliment representation, but what do you mean by "a number"?

https://en.wikipedia.org/wiki/Twos_Compliment

 

[bh_letters]

I meant integer when I said number. I am looking for optimal circuit for representing an integer in its two's complement form.

 

[tronix]

Well one option can be take a 4 bit subtractor and subtract the no. you want to convert from '0'.The output will be two's complement of the input.
And second can obviously can be to flip all bits (one's complement) using xor gates followed by adding one.

 

[Thinkie]

Invert and add one