very important question ( must see)

let's say i have 2 BCD input each input has 4 bit
and i want to swap the input order if the first input is higher than the second input.
is there a chip can do me this even in binary!!!!!! or what is the method that i can do in order to do this.

because i'm doing subtraction in 2 full adder and i want to swap the input order in order to get the number in positive and will have the carry as the negative sign ^_^

i don't understand your post, how can i implement it!! it seams that associated with voltage

Look up Magnitude Comparator, one option is the 74F85

well i got it work ^_^ thanks for the help of the magnitude comparator
it helped me a lot i knew how to figure out the rest