calcul numeric lab 1

#pragma warning(disable:4996)
#include <stdio.h>
#include <conio.h>
#include <stdlib.h>
#include <iostream>
#include <string>
#include <math.h>
#include <cmath>

using namespace std;

double func1(double x) {
    return x*exp(x) - 1;
}

double func2(double x) {
    double xderiv = x;
    return (xderiv + 1)*exp(x);
}

void main() {
    double epsilon;
    double x, ITMAX;
    int n = 1;
    x = 0;
    epsilon = 0.001;
    ITMAX = 100;

    while ( (fabs(x*exp(x)-1) > epsilon ) && (n <= ITMAX)) {
        x = x - (func1(x) / func2(x));
        n = n + 1;
    }
    if (n > ITMAX) {
        cout << "In" << ITMAX << " iteratii nu a fost realizata aproximarea dorita";
    }
    else {
        cout << "Aproximarea obtinuta este: " << x;
    }

    _getche();
}

//#####################################################################################
#pragma warning(disable:4996)
#include <stdio.h>
#include <conio.h>
#include <stdlib.h>
#include <iostream>
#include <string>
#include <math.h>
#include <cmath>

using namespace std;

#define func

void main() {
    double a=2,x=2,epsilon=0.001,ITMAX=100;
    double p=2;
    int n = 1;
    while (fabs(pow(x,p)-a) > epsilon && n <= ITMAX) {
        x = (1 / p) * ((p - 1)*x + a / (pow(x, p - 1)));
        n = n + 1;
    }

    if (n > ITMAX) {
        cout << "In" << ITMAX << "iteratii nu a fost realizata aproximarea dorita";
    }
    else {
        cout << "Aproximarea obtinuta este: " << x;
    }

    _getche();
}

//##############################################################################################
#pragma warning(disable:4996)
#include <stdio.h>
#include <conio.h>
#include <stdlib.h>
#include <iostream>
#include <string>
#include <math.h>
#include <cmath>

using namespace std;

double func(double x) {
    double xx = x;
    return xx*exp(xx) - 1;
}

void main() {
    double x,x_0, x_1, epsilon, ITMAX;
    int n;

    n = 2;
    epsilon = 0.001;
    x = x_0 =  0;
    x_1 = 1;
    ITMAX = 100;
    while (fabs(func(x_1)) > epsilon && n <= ITMAX) {
        x = x_1 - ((func(x_1)*(x_1 - x_0)) / (func(x_1) - func(x_0)));
        x_0 = x_1;
        x_1 = x;
        n = n + 1;
    }
    if (n > ITMAX) {
        cout << "in" << ITMAX << "iteratii nu a fost realizata aproximarea dorita";
    }
    else {
        cout << "Aproximarea obtinuta este:" << x;
    }

    _getche();
}