[Challenge ] A Simple challenge ... Find the roots of a quadratic equation

Question

condition :
D=(b^2 )-4ac
Nature of the roots.
If D>0, the roots are real and distinct .
If D=0, the roots are real and equal.
If D<0, then roots are imaginary .
Then ,
Calculate roots of a quadratic equation

My code in CPP

https://code.sololearn.com/cu4r22lsSSNd/?ref=app

Answer 1

https://code.sololearn.com/czk3c9CBvjOb/?ref=app

Answer 2

https://code.sololearn.com/ciWX67HN0J61/?ref=app

Answer 3

https://code.sololearn.com/cPwEf4SMEuOG/?ref=app

Answer 4

https://code.sololearn.com/cEIV1dnFaAGs/?ref=app

Answer 5

roots

Answer 6

what roots??