using System;

​

​

public class Program

{

public static void Main()

{

Console.WriteLine("ax3+bx2+cx+d");

Console.Write("a: ");

int a = Convert.ToInt32(Console.ReadLine());

Console.Write("b: ");

int b = Convert.ToInt32(Console.ReadLine());

Console.Write("c: ");

int c = Convert.ToInt32(Console.ReadLine());

Console.Write("d: ");

int d = Convert.ToInt32(Console.ReadLine());

​

double x0 = -100;

double x1 = -99;

double fx0 = 0;

double fx1 = 0;

​

double x0test = (a*x0)*(a*x0)*(a*x0)+(b*x0)*(b*x0)+c*x0+d;  

double x1test = (a*x1)*(a*x1)*(a*x1)+(b*x1)*(b*x1)+c*x1+d;

​

if ((x0test < 0) && (x1test < 0)){

​

do{

​

​

fx0 = 0;

fx1 = 0;

fx0 = (a*x0)*(a*x0)*(a*x0)+(b*x0)*(b*x0)+c*x0+d;

fx1 = (a*x1)*(a*x1)*(a*x1)+(b*x1)*(b*x1)+c*x1+d;

x0 += 1;

x1 += 1;

​

​

} while((fx0 < 0) && (fx1 < 0));

x0 -= 1;

x1 -= 1;

Console.WriteLine("Промежуток между " + x0 + " и " + x1);

​

double xn1 = x1;

double fxn1 = 0;

int i2 = 0;

do {

fxn1 = (a*xn1)*(a*xn1)*(a*xn1)+(b*xn1)*(b*xn1)+c*xn1+d;

Console.WriteLine("fxn = " + fxn1);

xn1 = xn1 - ((fxn1*(xn1-x0))/(fxn1-fx0));

Console.WriteLine("xn = " + xn1);

i2++;

} while(i2 < 110);

Console.WriteLine("X = " + xn1);

}

​

​

​

if ((x0test > 0) && (x0test > 0)){

​

do{

​

fx0 = 0;

fx1 = 0;

fx0 = (a*x0)*(a*x0)*(a*x0)+(b*x0)*(b*x0)+c*x0+d;

Console.WriteLine("fx0 " + fx0);

fx1 = (a*x1)*(a*x1)*(a*x1)+(b*x1)*(b*x1)+c*x1+d;

Console.WriteLine("fx1 " + fx1);

x0 += 1;

x1 += 1;

​

​

} while((fx0 > 0) && (fx1 > 0));

x0 -= 1;

x1 -= 1;

Console.WriteLine("Промежуток между " + x0 + " и " + x1);

​

double xn = x1;

double fxn = 0;

int i = 0;

do {

fxn = (a*xn)*(a*xn)*(a*xn)+(b*xn)*(b*xn)+c*xn+d;

Console.WriteLine("fxn = " + fxn);

xn = xn - ((fxn*(xn-x0))/(fxn-fx0));

Console.WriteLine("xn = " + xn);

i++;

} while(i < 110);

Console.WriteLine("X = " + xn);

}   

​

​

​

​

} 

​

}

​

​