#include <stdio.h>
#include <locale.h>
#include <math.h>

float *func(float xl, float xr) {

    float res[2];
    float n = 0;
    float X = (xl + xr) / 2;

    while (fabs(X - cos(X)) > 0.000001) {
        n++;
        if (X > cos(X)) {
            xr = X;
            X = (xr + xl) / 2;
        } else if (X < cos(X)) {
            xl = X;
            X = (xr + xl) / 2;
        }
    }

    res[0] = X;
    res[1] = n;

    return res;
}

float *func2(float xl1, float xr1) {

    float res1[2];
    float n1 = 0;
    float X1 = (xl1 + xr1) / 2;

    while (fabs(X1 - cos(X1)) > 0.00000001) {
        n1++;
        if (X1 > cos(X1)) {
            xr1 = X1;
            X1 = (xr1 + xl1) / 2;
        } else if (X1 < cos(X1)) {
            xl1 = X1;
            X1 = (xr1 + xl1) / 2;
        }
    }

    res1[0] = X1;
    res1[1] = n1;

    return res1;
}

float *func3(float xl2, float xr2, float k) {

    float res2[2];
    float n2 = 0;
    float X2 = (xl2 + xr2) / 2;

    while (fabs(X2 - k * cos(X2)) > 0.000001) {
        n2++;
        if (X2 > k * cos(X2)) {
            xr2 = X2;
            X2 = (xr2 + xl2) / 2;
        } else if (X2 < k * cos(X2)) {
            xl2 = X2;
            X2 = (xr2 + xl2) / 2;
        }
    }

    res2[0] = X2;
    res2[1] = n2;

    return res2;
}

int main() {
    setlocale(0, "");
    float x = 0;
    int n = 0;
    float delta = 0.000001;
    float delta1 = 0.00000001;
    fflush(stdout);
    printf("\nУравнение: x-cos(x)=0. Погрешность: %f", delta);
    printf("\n № метода%8sx%15sN", "", "");

    while (fabs(x - cos(x)) > delta) {
        x = cos(x);
        n++;
    }
    printf("\n1%15s%.8f%7s%d", "", x, "", n);

    float *res;
    res = func(-1, 1);
    printf("\n2%15s%.8f%7s%d", "", res[0], "", (int) res[1]);

    x = 0;
    n = 0;

    while (fabs(x - cos(x)) > delta) {
        x = x - ((x - cos(x)) / (1 + sin(x)));
        n++;
    }
    printf("\n3%15s%.8f%7s%d", "", x, "", n);

    printf("\n\nУравнение: x-cos(x)=0. Погрешность: %.8f", delta1);
    printf("\n № метода%8sx%15sN", "", "");

    double x1 = 0;
    int n1 = 0;

    while (fabs(x1 - cos(x1)) > delta1) {
        x1 = cos(x1);
        n1++;
    }
    printf("\n1%15s%.8lf%7s%d", "", x1, "", n1);

    float *res1;
    res1 = func2(-1, 1);
    printf("\n2%15s%.8f%7s%d", "", res1[0], "", (int) res1[1]);

    x1 = 0;
    n1 = 0;

    while (fabs(x1 - cos(x1)) > delta1) {
        x1 = x1 - ((x1 - cos(x1)) / (1 + sin(x1)));
        n1++;
    }
    printf("\n3%15s%.8f%7s%d", "", x1, "", n1);
    printf("\n\nУравнение: x - k * cos(x) = 0. k = 5. Погрешность: %f", delta);
    printf("\n № метода%8sx%15sN", "", "");

    double x2 = 0;
    int n2 = 0;
    double k = 5;

    while (fabs(x2 - k * cos(x2)) > 0.000001) {
        x2 = k * cos(x2);
        n2++;
    }
    printf("\n1%15s%.8lf%7s%d", "", x2, "", n2);

    float *res2;
    res2 = func3(-5, 5, 5);
    printf("\n2%15s%.8f%7s%d", "", res2[0], "", (int) res2[1]);

    x2 = 0;
    n2 = 0;

    while (fabs(x2 - k * cos(x2)) > delta) {
        x2 = x2 - ((x2 - k * cos(x2)) / (1 + k * sin(x2)));
        n2++;
    }
    printf("\n3%15s%.8lf%7s%d", "", x2, "", n2);


    printf("\n\nУравнение: x - k * cos(x) = 0, k = 10. Погрешность: %f", delta);
    printf("\n № метода%8sx%15s№", "", "");

    double x3 = 0;
    int n3 = 0;
    double k1 = 10;

    while (fabs(x3 - k1 * cos(x3)) > 0.000001) {
        x3 = k * cos(x3);
        n3++;
    }
    printf("\n1%15s%.8lf%7s%d", "", x3, "", n3);


    float *res3;
    res3 = func3(-10, 10, 10);
    printf("\n2%15s%.8f%7s%d", "", res3[0], "", (int) res3[1]);

    x3 = 0;
    n3 = 0;

    while (fabs(x3 - k1 * cos(x3)) > delta) {
        x3 = x3 - ((x3 - k1 * cos(x3)) / (1 + k1 * sin(x3)));
        n3++;
    }
    printf("\n3%15s%.8lf%7s%d", "", x3, "", n3);

    return 0;
}