Swift Tutorial
Python Java C++ C C# PHP R SQL DS Algo InterviewQ

Swift - Bitwise AND operator



The Bitwise AND operator (&) is a binary operator which takes two bit patterns of equal length and performs the logical AND operation on each pair of corresponding bits. It returns 1 if both bits at the same position are 1, else returns 0.

Bit_1Bit_2Bit_1 & Bit_2
000
100
010
111

The example below describes how bitwise AND operator works:

50 & 25 returns 16

     50    ->    110010  (In Binary)
   & 25    ->  & 011001  (In Binary)
    ----        --------
     16    <-    010000  (In Binary)  

The code of using Bitwise AND operator (&) is given below:

x = 50
y = 25

#Bitwise AND operation
z = x & y

#Displaying the result
puts("z = #{z}")


var x = 50
var y = 25

//Bitwise AND assignment operation
x &= y

//Displaying the result
print("x = ", x)

The output of the above code will be:

z = 16

Example: Check if a number is even or odd

The last bit of an even number is always 0, whereas for an odd number it bit is always 1. For a given number n, (n & 1) returns 0 if the n is even, else returns 1.

Even Number: 

     50   ->    110010  (In Binary)
    & 1   ->  & 000001  (In Binary)
    ----       --------
      0   <-    000000

Odd Number: 

     99   ->    1100011  (In Binary)
    & 1   ->  & 0000001  (In Binary)
    ----       ---------
      1   <-    0000001

The below code checks whether a given number is even or odd:

def CheckEven(myNum)
  if ((myNum & 1) == 1)
    puts("#{myNum}  is an odd number.")
  else
    puts("#{myNum} is an even number.")
  end
end

CheckEven(50)
CheckEven(99)


func CheckEven(myNum: Int) {
  var x = myNum
  x &= 1
  if (x == 1) {
    print(myNum, " is an odd number.")
  } else {
    print(myNum, " is an even number.")
  }
}

CheckEven(myNum: 50)
CheckEven(myNum: 99)

The above code will give the following output:

50 is an even number.
99 is an odd number.

❮ Swift - Operators

5