Dev - C++ - Necesito para hoy ayudenme

#include <iostream>

using namespace std;

int main() {

    int n,i;

    cout << "Ingrese valor de n: ";

    cin >> n;

    cout << "\nSuma" << endl;

    for (i=1; i<=n; i++) {

        cout << i << " + " << n << " = " << i+n << endl;

    }

    return 0;

}

#include <iostream>

using namespace std;

int main() {

    int n,i;

    cout << "Ingrese valor de n: ";

    cin >> n;

    cout << "\nSuma" << endl;

    for (i=1; i<=n; i++) {

        cout << i << " + " << n << " = " << i+n << endl;

    }

    cout << "\nResta" << endl;

    for (i=1; i<=n; i++) {

        cout << i << " - " << n << " = " << i-n << endl;

    }

    return 0;

}

#include <iostream>

using namespace std;

int main() {

    int i;

    double n;

    cout << "Ingrese valor de n: ";

    cin >> n;

    cout << "\nDivision" << endl;

    for (i=1; i<=n; i++) {

        cout << i << " / " << n << " = " << i/n << endl;

    }

    return 0;

}

#include <iostream>

using namespace std;

int main() {

    int n,i;

    cout << "Ingrese valor de n: ";

    cin >> n;

    cout << "\nSuma" << endl;

    for (i=1; i<=n; i++) {

        cout << i << " + " << n << " = " << i+n << endl;

    }

    cout << "\nResta" << endl;

    for (i=1; i<=n; i++) {

        cout << i << " - " << n << " = " << i-n << endl;

    }

    cout << "\nDivision" << endl;

    for (i=1; i<=n; i++) {

        cout << i << " / " << n << " = " << (double)i/(double)n << endl;

    }

    return 0;

}

#include <iostream>

using namespace std;

int main() {

    int i,n;

    cout << "Ingrese valor de n: ";

    cin >> n;

    cout << "\nDivision" << endl;

    for (i=2; i<=n*2; i=i+2) {

        cout << i << " / " << "2" << " = " << i/2 << endl;

    }

    return 0;

}