quadratic/quadratic.c

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <string.h>

int main(int num_arg, char **args)
{
    double num_A, num_B, num_C;

    if (num_arg <= 1)
    {
        system("quadratic-tui"); // make sure it is in PATH along with "quadratic" bin
    }
    else
    {
        num_A = atof(args[1]);
        num_B = atof(args[2]);
        num_C = atof(args[3]);

        double radical = pow(num_B, 2) + (-4 * num_A * num_C);

        if (radical < 0.0)
        {
            // roots are complex
            double real_part = (-num_B) / (2 * num_A);
            double imaginary_part = sqrt(radical * -1.0) / (2 * num_A);

            printf("%g+%gi\t %g-%gi\n", real_part, imaginary_part, real_part, imaginary_part);
        }
        else
        {
            // roots are real
            double numerator_1 = (-num_B) + sqrt(radical);
            double numerator_2 = (-num_B) - sqrt(radical);
            double zero_1_ptr = numerator_1 / (2 * num_A);
            double zero_2_ptr = numerator_2 / (2 * num_A);

            printf("%g\t %g\n", zero_1_ptr, zero_2_ptr);
        };
    };
    return 0;
};