LinuxSystemTask/QuadEq.c

#include <math.h>

#define FILE_IN "argument.txt"
#define FILE_OUT "result.txt"
#define BUFFER 512
#define ERROR_OPEN_FILE -3
#define ERROR_READ_DATA -4
#define ERROR_INPUT_DATA -5
#define ERROR_WRITE_DATA -6


struct QuadraticEquation
{
	//коэффициенты
	double a;
	double b;
	double c;
	/// <summary>
	/// Значение дискриминанта.
	/// </summary>
	double discriminant;
	/// <summary>
	/// Кол-во корней.
	/// </summary>
	int countRoot;
	//значения корней
	double x1;
	double x2;
};

typedef struct QuadraticEquation QuadraticEquation;


void solutionQuadraticEquation(QuadraticEquation* equation)
{

	equation->discriminant = equation->b * equation->b - 4 * equation->a * equation->c;
	if (equation->discriminant < 0)
	{
		equation->countRoot = 0;
		return;
	}
	if (equation->discriminant == 0)
	{
		equation->x1 = (-(equation->b) / (2 * equation->a));
		equation->countRoot = 1;
		return;
	}
	if (equation->discriminant > 0)
	{
		equation->x1 = (-equation->b + sqrtf(equation->discriminant)) / (2 * equation->a);
		equation->x2 = (-equation->b - sqrtf(equation->discriminant)) / (2 * equation->a);
		equation->countRoot = 2;
		return;
	}

}