C - Need to compare `n` lowest bits of an int for

Question

C - Need to compare n lowest bits of an int for equality.

I.e. n = 4;

xxxx1001 == xxxx1001 (x is don't care)

I.e. n = 2; xxxxxx01 == xxxxxx01

Can't think of a nice way to do it without using masks, =).

Answer 1

you could use the modulo operator. For example n = 4 and you have to ints x and y:

if((x%16) == (y%16)){ ....

Hope this helps you.

Nick