Bitwise '&' operator

Question

I am lacking some basic understanding in bitwise \'&\' operator.

5 = 101
4 = 100

So why the output of the below if conditi

Answer 1

Understanding bitwise operator truth tables is crucial. Consider the following, where A and B are inputs and Y is the output.

& (Bitwise And) When inputs A and B are true, output is true; otherwise output is false

A   B   Y
---------
0 | 0 | 0
0 | 1 | 0
1 | 0 | 0
1 | 1 | 1

| (Bitwise Or) When A or B or both inputs are true output is true; otherwise output is false

A   B   Y
---------
0 | 0 | 0
0 | 1 | 1
1 | 0 | 1
1 | 1 | 1

^ (Bitwise X-Or) When A and B are opposite states, output is true; otherwise output is false

A   B   Y
---------
0 | 0 | 0
0 | 1 | 1
1 | 0 | 1
1 | 1 | 0

! (Bitwise Not) Output is the opposite state of the input

A   Y
-----
0 | 1
1 | 0

Your Equation (5 & 4) == (0101 & 0100) == 0100 == 4 == true

  0101
& 0100
------
  0100