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redlichan (4)
How do I make a program that solves for the roots of a Quadratic Equation. It should be able to accept decimal and able to print even the imaginary root? I really need your help on the imaginary part... Please....
Stewbond (2827)
I haven't tested this, but I think it would work.. It works!
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#include <iostream>
#include <complex>

// inputs a, b, c
// output: root[2]
void QuadraticEqu(const double a, const double b, const double c,
                             std::complex<double> root[2])
{
    std::complex<double> discriminant(b*b - 4*a*c , 0.0);

    root[0] = (-b + sqrt(discriminant)) / (2*a);
    root[1] = (-b - sqrt(discriminant)) / (2*a);
}

int main()
{
    std::complex<double> roots[2];

    QuadraticEqu(1, -4, 8, roots);

    std::cout << roots[0] << '\t' << roots[1] << std::endl;
}
 
(2,2)   (2,-2)
Last edited on
redlichan (4)
Thanks Mr Stewbond.. IT surely will be a great help...
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