Write a recursive function that returns the number of 1 in the binary representation of n. use the fact that this is equal to the number of 1 in the representation of n/2, plus 1, if n is odd.

#here is code in python

# recursive function that counts the number of 1's

def bin_count(num):

   #base condition

   if num==0:

       return (0)

   elif num == 1:

       return (1)

   else:

       #recursive call

       return bin_count(num//2)+bin_count(num%2)

#read a number

num=int(input("enter a number:"))

#call the function

print("number of 1's is:",bin_count(num))

Explanation:

Read a number from user and call the function bin_count() with parameter num. In the function, if num=0 then it will return 0.If num is 1 then return 1 else it will count the number of 1's inn the binary representation of the number and return the count.

Output:

enter a number:63

number of 1's is: 6

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