(C++) SolveQuadratic

February 24, 2017 · View on GitHub

 

 

 

 

 

(C++) SolveQuadratic

 

SolveQuadratic is a math code snippet to solve a quadratic equation.

 

SolveQuadratic is demonstrated in the tool QuadraticSolver.

 

Exercise #6: refactoring quadratic solver is an exercise about refactoring a quadratic equation solver class.

 

 

#include <cmath> #include <vector> //From http://www.richelbilderbeek.nl/CppSolveQuadratic.htm const std::vector<double> SolveQuadratic(const double a, const double b, const double c) {   if (a == 0.0)   {     if (b == 0.0)       return std::vector<double>(1,0.0);     else       return std::vector<double>(1,c/b);   }   const double d = (b * b) - (4.0 * a * c);   if (d < 0.0)     return std::vector<double>();   if (d == 0.0)     return std::vector<double>(1,-b/(2.0*a));   const double rD = std::sqrt(d);   std::vector<double> solutions;   solutions.reserve(2);   solutions.push_back((-b + rD)/(2.0 * a));   solutions.push_back((-b - rD)/(2.0 * a));   return solutions; }