Undefined reference to sqrt() | Sololearn: Learn to code for FREE!
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Undefined reference to sqrt()

I include the <math.h> but the code still not recognising basic operations such as sqrt or pow. https://code.sololearn.com/cEBuyGQdCrHL/?ref=app

25th Oct 2019, 9:47 PM
Guillermo Alonso
7 ответов
+ 10
First of all, don't be frustrated and congratulation as you've just discovered a bug in SoloLearn! After a quick check I believe it's a linker problem of the C online compiler used by SoloLearn. You may report this behaviour to info@sololearn.com and meanwhile you may try to run your code at other cloud compilers available like:- https://www.onlinegdb.com P/S: I've verified with link above and it works! 😉
26th Oct 2019, 1:18 AM
Zephyr Koo
Zephyr Koo - avatar
+ 4
Hi Zephyr Koo , It's been a long time! Been busy with work I guess? This is really intriguing case, because I could get the code to run (Yes in Code Playground) when I pass a literal value as argument for `sqrt` printf("sqrt(361) = %.0lf", sqrt(361)); // this works, strangely At first I thought the problem was with the format specifier "%d\n" at line 10, but nope, I was wrong. It still doesn't work although I changed it to "%d" only. Tried to change some numbers by adding decimal point, and occasional casting, but it didn't work either. s = s + 1.0 / (double)(i*i); // didn't help pi = sqrt(6.0 * s); // didn't help Looking forward for others' opinions : )
26th Oct 2019, 3:19 AM
Ipang
+ 4
Chum4k3r Wow indeed thanks for informing! It's probably the weirdest bug I've seen in SoloLearn. 👍
27th Oct 2019, 11:52 PM
Zephyr Koo
Zephyr Koo - avatar
+ 3
Guillermo Alonso Zephyr Koo Ace I found these on SO, seems it be a compiler issue (gcc if I understand it correctly). No experience with compiler command options so I'm leaving this to you guys 👍 [Referenced from the thread below] https://stackoverflow.com/questions/5248919/undefined-reference-to-sqrt-or-other-mathematical-functions [Marked as duplicate (forwarded to one above)] https://stackoverflow.com/questions/10409032/why-am-i-getting-undefined-reference-to-sqrt-error-even-though-i-include-math
26th Oct 2019, 4:22 AM
Ipang
+ 3
Ipang Yup it has been awhile and feel grateful to be able to come back from time to time! You've got some good observation and I really wonder the strange behaviour as well. Nice catch! 😉
27th Oct 2019, 1:58 PM
Zephyr Koo
Zephyr Koo - avatar
+ 3
I was facing this issue in my code yesterday, but today it worked. Seems like the linker bug has been fixed
27th Oct 2019, 7:58 PM
Chum4k3r
Chum4k3r - avatar
+ 2
Good to have you back Zephyr Koo 👍
27th Oct 2019, 2:12 PM
Ipang