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Kódom

#include <iostream>

#include <cmath>

using namespace std;

int main() {

float a, b, c, d, x1, x2, x3, Y, A, B, imaginaryPart;

cout << "Enter coefficients a, b, c and d: " << endl;

cout << "a=";

cin >> a;

cout << "b=";

cin >> b;

cout << "c=";

cin >> c;

cout << "d=";

cin >> d;

A = (27*a*a*c-9*a*b*b)/(27*a*a*a);

B = (2*b*b*b-9*a*b*c+27*a*a*d)/(27*a*a*a);

Y = (B/2)*(B/2)+(A/3)*(A/3)*(A/3);

if (Y >= 0) {

x1 = (-b/3/a+cbrt(-B/2+sqrt(Y))+cbrt(-B/2-sqrt(Y)));

x2 = (-b/3/a-0.5*(cbrt(-B/2+sqrt(Y))+cbrt(-B/2-sqrt(Y))));

x3 = (-b/3/a-0.5*(cbrt(-B/2+sqrt(Y))+cbrt(-B/2-sqrt(Y))));

imaginaryPart = ((sqrt(3)/2)*(cbrt(-B/2+sqrt(Y))-cbrt(-B/2-sqrt(Y))));

cout << "x1 = " << x1 << endl;

cout << "x2 = " << x2 << "+" << imaginaryPart << "i" << endl;

cout << "x3 = " << x3 << "-" << imaginaryPart << "i" << endl;

} else {

x1 = (-b/3/a+2*sqrt(-A/3)*cos(1/3*acos((-B/2)/(sqrt(-A/3*-A/3*-A/3)))));

x2 = (-b/3/a+2*sqrt(-A/3)*cos(2*M_PI/3+1/3*acos((-B/2)/(sqrt(-A/3*-A/3*-A/3)))));

x3 = (-b/3/a+2*sqrt(-A/3)*cos(2*M_PI/3-1/3*acos((-B/2)/(sqrt(-A/3*-A/3*-A/3)))));

cout << "x1 = " << x1 << endl;

cout << "x2 = " << x2 << endl;

cout << "x3 = " << x3 << endl;

}

return 0;

}