what is the difference between "|" and "^" ?

Answer 1

XOR means exclusive OR. so only one of the two inputs should be 1.
1 ^ 0 = 1
0 ^ 1 = 1
0 ^ 0 = 0
1 ^ 1 = 0
While | is just OR. So _atleast_ one input should be 1.

Answer 2

😄

Answer 3

Or, exponent of, xor.