Error in ch4 - primitive types

**jetsondavis** · February 12, 2019, 6:40am

Not sure what edition I have - just purchased it from Amazon 2/8/2019.

Unless I’m mistaken, the code on page 23 has an error. The code is supposed to return the number of bits in a number passed to the func count_bits, but it in fact returns the number of bits of value 1.

The fourth line should be:
num_bits += 1
Instead of:
num_bits += x & 1

Can someone pls confirm? Thx

**D1scobo1** · February 12, 2019, 11:12am

No this is correct: The book says: ‘Writing a program to count the number of bits that are set to 1 in a nonnegative integer…’

So it should only count the integers that are actually set to 1.

**jetsondavis** · February 12, 2019, 6:56pm

Oh, you’re right. Thanks!