Написать программу чтобы выводила надпись Hello world

#include <iostream>
 
using namespace std;
 
int main() {
     cout << "Hello World!\n";
     return 0;
}

#include <iostream>
using std::cout; using std::cin;
 
int main()
{
    char mass[] = "H_pp_p_t_m_nstr_sesquipedaliophzbia";
    cout << (char)(strlen("YOU is will .... your self") * 4);
    cout << (char)(strlen("YOU is will .... your self") * 4 - strlen( strchr(mass,'b')));
    for (int i = 0; i < 2; ++i)
        cout << (char)(strlen(strchr(mass, 'm')) * 4 + strlen(strchr(mass, 'z')));
    cout << (char)(strlen("YOU is will .... your self") * 4 + strlen(strchr(mass, 'o')))<< " ";
    cout << (char)(sizeof(mass)* 3 + strlen(strchr(mass, 'd')));
    cout << (char)(sizeof(mass)* 3 + strlen(strchr(mass, 'b')));
    cout << mass[strlen(strchr(mass, 'i'))];
    cout << (char)(strlen(strchr(mass, 'm')) * 4 + strlen(strchr(mass, 'z')));
int end = strlen(strchr(mass, 'a')) * 10;
    cout << (char)end;
cin.get();
    return 0;
}

#include <iostream>
#include <cmath>
 
double f(double x) {
    return 0.000000120374004 * pow(x, 14) - 0.000010301715998 * pow(x, 13) +
           0.000389764876314 * pow(x, 12) - 0.008566800164091 * pow(x, 11) +
           0.120781166862005 * pow(x, 10) - 1.136441633229210 * pow(x, 9) +
           7.174763107379320 * pow(x, 8) - 29.560999410295300 * pow(x, 7) + 
           72.801384971768600 * pow(x, 6) - 76.896048284251800 * pow(x, 5) -
           70.144917975627400 * pow(x, 4) + 267.743201139493000 * pow(x, 3) -
           193.669628010749000 * pow(x, 2) + 72.0 * x - 10050.0;
}
 
double df(double x, double eps = 0.000001) {
    return (f(x + eps) - f(x - eps)) / (2*eps);
}
 
int main()
{
    for (unsigned i = 0; i < 13; i++)
        std::cout << (char)round(df(i));
}