&&: Logical OR | |: Logical vs.

&&: Logic and
A && B && C
True if all conditions are true, otherwise false

| |: Logical OR
A | | B | | C
When all conditions are false, the result is false, otherwise ture

&: Bit and
Bitwise (BIT) is associated with the operation, the corresponding bit is 1 o'clock, the result bit is 1, otherwise 0
9 & 3 = 1
Bits are expressed as:
1001 (9)
& 0011 (3)
--------------
= 0001 (1)

|: bit or
Bitwise (BIT) or operation, the corresponding bit is 0 o'clock, the result bit is 0, otherwise 1
9 | 3 = 11
Bits are expressed as:
1001 (9)
& 0011 (3)
--------------
= 1011 (11)

&&: Logical OR | |: Logical vs.