22. Write a program with a function 'fun' that takes an integer as its argument and changes the n-th bit (counting starting from the right, and with 1) in its binary-number representation and replaces it with 1 if it is 0 and with 0 if it is 1 , and then returns the integer with replacements. For instance, fun (6,2) should return 4 because in 6=110(2) we replace 1 with 0 to obtain 100 . Similarly, fun (9,3)=13 since we replace 9= 1001(2) with 1101(2)