First Lab Work

#include <iostream>
#include <iomanip>
#include <math.h>

using namespace std;

double xx0, xx1; // промежуток в ответе шагового метода
double a = 0.5, b = 1, h = 0.05, e = 0.001; // исходные данные

double F(double x)
{
    return (x + cos(pow(x, 0.5) + 2));
}
double F1(double x)
{
    return ((1 - sin(pow(x, 1. / 2.) + 2)) / pow(x, 1. / 2.));
}
double S(double x)
{
    return (-cos(pow(x, 0.5) + 2));
}

void shag_metod() {
    double x0 = a, x1 = x0 + h;
    while (x1 <= b)
    {
        x1 = x0 + h;
        if (F(x0)*F(x1)<0) {
            cout << "x na intervale [" << x0 << "," << x1 << "]" << endl;
            xx0 = x0;
            xx1 = x1;
        }
        x0 = x1;
    }
}
void pol_del() {
    double x = xx0;
    a = xx0;
    b = xx1;
    while (fabs(F(x))>e)
    {
        x = (a + b) / 2;
        if (F(a)*F(x)<0) b = x;
        else a = x;
    }
    cout << "METOD POLOVINNOGO DELENIA x=" << x << endl;
}
void nuton() {
    double x2 = xx0;
    while (fabs(F(x2))>e)
    {
        x2 = x2 - F(x2) / F1(x2);
    }
    cout << "METOD N'UTONA x=" << x2 << endl;
}
void pros_iter() {
    double x3 = xx0;
    while (fabs(F(x3))>e)
    {
        x3 = S(x3);

    }
    cout << "METOD PROSTOI ITERACII x=" << x3 << endl;
}
int main()
{
    shag_metod();
    pol_del();
    nuton();
    pros_iter();
    system("pause");
    return 0;
}