Лаба 8 Вариант 13

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

using namespace std;

typedef double(*uf)(double, double, int &);
void tabl(double, double, double, double, uf);
double y(double, double, int &);
double s(double, double, int &);

int main()
{
    cout << setw(8) << "x" << setw(15) << "y(x)" << setw(10) << "k" << endl;
    tabl(-0.9, 0.9, 0.1, 0.001, y);
    cout << endl;
    cout << setw(8) << "x" << setw(15) << "s(x)" << setw(10) << "k" << endl;
    tabl(-0.9, 0.9, 0.1, 0.001, s);
    return 0;
}

void tabl(double a, double b, double h, double eps, uf fun)
{
    int k = 0; double sum;
    for (double x = a; x < b + h / 2; x += h)
    {
        sum = fun(x, eps, k);
        cout << setw(8) << x << setw(15) << sum << setw(10) << k << endl;
    }
}

double y(double x, double eps, int &k)
{
    return log(2 * cos(x / 2));
}

double s(double x, double eps, int &k)
{
    double a, c, sum;
    sum = a = c = 0;
    a = 1;
    k = 1;
    while (fabs(a) > eps)
    {
        a = pow(-1, k - 1) * cos(k * x) / k;
        sum += a;
        k++;
    }
    return sum;
}