Script for swapping gender in sql server through CASE (Without Using Cursor)

I want to share you my experience about an interview where i was asked to write script for swapping gender using cursor and without using cursor.
   In my previous post I mentioned "Script for swapping gender through CURSOR" .Here I am sharing swapping gender using CASE .

Step 1: First of all create a table ,here "genderTest"

            CREATE TABLE  genderTest (id nvarchar(20) PRIMARY KEY,empname nvarchar(20),gender           nvarchar(1))

Step 2:Now insert some values in table

       INSERT INTO gendertest VALUES ('1','ashish','m')
       INSERT INTO gendertest VALUES ('2','nandani','f')
       INSERT INTO gendertest VALUES ('3','chandrasen','m')
       INSERT INTO gendertest VALUES ('4','priynka','f')
       INSERT INTO gendertest VALUES ('5','sonam','f')
       INSERT INTO gendertest VALUES ('6','guru','m')
       INSERT INTO gendertest VALUES ('7','faisal','m')
       INSERT INTO gendertest VALUES ('8','priti','f')

Step 3: Execute following query


           UPDATE genderTest 
           SET gender=
          CASE gender
          WHEN 'f' THEN 'm'
          ELSE 'f'
      END
   Above script will swap gender.