![ubuntu 18.04 -->> error: 'floor' was not declared in this scope / error: 'sqrt' was not declared in this scope · Issue #3 · CogChameleon/ChromaTag · GitHub ubuntu 18.04 -->> error: 'floor' was not declared in this scope / error: 'sqrt' was not declared in this scope · Issue #3 · CogChameleon/ChromaTag · GitHub](https://user-images.githubusercontent.com/22295169/57237570-cbfe8000-7027-11e9-8cb5-51085d353d35.png)
ubuntu 18.04 -->> error: 'floor' was not declared in this scope / error: 'sqrt' was not declared in this scope · Issue #3 · CogChameleon/ChromaTag · GitHub
![Error] cout was not delcared in this scope c++, how to fix cout cin not declared in this scope dev - YouTube Error] cout was not delcared in this scope c++, how to fix cout cin not declared in this scope dev - YouTube](https://i.ytimg.com/vi/NU68V56i7lo/maxresdefault.jpg)
Error] cout was not delcared in this scope c++, how to fix cout cin not declared in this scope dev - YouTube
![Was not declared in this scope- Mensaje Arduino- Solución 1- Revisar nombres: variable mal declarada - YouTube Was not declared in this scope- Mensaje Arduino- Solución 1- Revisar nombres: variable mal declarada - YouTube](https://i.ytimg.com/vi/SzbV12xNAhg/maxresdefault.jpg)
Was not declared in this scope- Mensaje Arduino- Solución 1- Revisar nombres: variable mal declarada - YouTube
![error compiling: 'D1' was not declared in this scope · Issue #18 · nidayand/motor-on-roller-blind-ws · GitHub error compiling: 'D1' was not declared in this scope · Issue #18 · nidayand/motor-on-roller-blind-ws · GitHub](https://user-images.githubusercontent.com/28128937/45780369-4d78dd80-bc12-11e8-837b-a61641f9c1ec.png)