Checking if bit is not set

Question

If I use this: if(value & 4) to check if the bit is set, then how do I check if the bit isn\'t set?

I tried with if(!value & 4) or

Answer 1

Simply:

if ((value & 4) == 0)

Why?

If value is 01110011

Then

01110011
&
00000100
--------

Will return 0 because 4th bit is off.