I think that Fibonacci it's very interesting, and it's a great opportunity to practice C++!
It generates all the Fibonacci numbers between 0 and the input you give it, and then calculate the golden ratio with the latests values in the sequence that were calculated.
You could also pass 0 to calculate Fibonacci numbers in a loop, but the results won't be good when the integer turns too big.
In order to build this, you have to go to the project directory and build it with make build, this should generate a binary called fibonacci by default.
And it's built! 🎉