How to calculate the sum of binary code ?

Question

Example: the binary code of number 9 is 1001. I want to calculate and get the result 2. 1+0+0+1 = 2. What should I do ?

Answer 1

https://code.sololearn.com/c5ylyXGKASMX/?ref=app

Answer 2

You can simply use the built-in function __builtin_popcount().
It returns number of set bits in binary representation of a number and that's what the sum of all 1's is.

Answer 3

Thanks Martin

Answer 4

Kiran Deep Naidu Thanks for your help.

Answer 5

I hope this helps you😊😊

Answer 6

Taylor, I have corrected the code as you said but I still wonder this gonna not be appropriate one because we need to apply the 2's complement for finding the binary of negative number.