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.

View the code of 'SolveQuadratic' in plain text


#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;

}

External links

Go back to Richel Bilderbeek's C++ page.

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(C++) SolveQuadratic

External links