add:
return *this;

I appreciate having this repo available as a resource as I'm working through the book.
This file, however, is just printing n_primes odd numbers, rather than n_primes first primes. It also skips 2.

Updated main, in case you care to update:
https://gist.github.com/pithonsmear/5477912532be67d1926271091214730c

I'm newbie, this program couldn't draw the clock until arrive return guimain(), so the clock hands couldn't update.

How can you solve this task? What formulas or algorithms did you use?
(file: Graph.cpp, function: Arrow::draw_lines() )

Dear @bewuethr

running the executable (after compiling with -std=c++11 or -std=c++14) a pointer being freed was not allocated error is obtained, coming from

Best,
Marco

Can you explain why you subtract 1 in function days_linear() ?

Hello and thank you for making this repository available to everyone.

I was going through exercises today and tried to solve the exercise 12 from chapter 11 on my own. I got pretty close and eventually wrote the same code as you did. Once that did not work, I tried your code and what happens is that the order of the characters in a new file is not reversed even though everything seems to be correct. Would you check that when you catch some time?

The program couldn't handle the input at the end of ( ), and result in breakpoint exception.

chapter 05 exercise 9 needs to modify exercise 8
not another

https://github.com/bewuethr/stroustrup_ppp/blob/b47ff8759174cf3aa8365d47bd61c3b4c06f8316/chapter18/chapter18_ex01.cpp#L50

fix
add: if (*(s1+i+1)==0 && *(s2+i+1) == 0) return 0; for handling identical words
change first condition to: if (*(s1+i+1)==0 && *(s2+i) || *(s1+i) < *(s2+i)) return -1;