How to print even numbers in c++?

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#include <iostream>

int main(int argc, char *argv[]) {

    int i = 1;
    while (i <= 100) {
        if (i % 2 == 0) {
            std::cout << i;
        }
        i++;
    }

    return 0;
}

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#include 

int main() {
    int n;
    std::cout << "Enter a number: ";
    std::cin >> n;

    std::cout << "Even numbers from 1 to " << n << " are: ";
    for (int i = 1; i <= n; i++) {
        if (i % 2 == 0) {
            std::cout << i << " ";
        }
    }

    return 0;
}

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#include 

int main() {
    int n, i = 1;
    std::cout << "Enter a number: ";
    std::cin >> n;

    std::cout << "Even numbers from 1 to " << n << " are: ";
    while (i <= n) {
        if (i % 2 == 0) {
            std::cout << i << " ";
        }
        i++;
    }

    return 0;
}

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#include 

int main() {
    int n, i = 1;
    std::cout << "Enter a number: ";
    std::cin >> n;

    std::cout << "Even numbers from 1 to " << n << " are: ";
    do {
        if (i % 2 == 0) {
            std::cout << i << " ";
        }
        i++;
    } while (i <= n);

    return 0;
}