Swap bits in a number in C [duplicate]

Answer 1

My skills in this area are new and therefore unproven so if I'm wrong then I learn something new, which is at least a part of the point of Stack Overflow.

Would a bitmask and XOR work also?

Like so?

var orginal=
var mask =00001110 //I may have the mask wrong
var value=1011 1110
var result=value^mask;

I might be misunderstanding things, forgive me if I've screwed up entriely.