Question

1. Write a complete C++ program to calculate the power of two for any integer number is input from the keyboard. Then, when that is done write a complete C++ program to calculate a table of factorials [user supplies the height]

Answer 1

#include <iostream>

using namespace std;

int powerOf2(int n) {
    if (n == 0) {
        return 1;
    } else {
        return 2*powerOf2(n-1);
    }
}

int main() {
    int n;
    cout << "Enter a positive integer: ";
    cin >> n;

    cout << "2 power " << n << " is " << powerOf2(n) << endl;
    return 0;
}

#include <iostream>

using namespace std;

int main() {
    int n;
    cout << "Enter a positive integer: ";
    cin >> n;

    cout << "n\t\tfactorial" << endl;
    int f = 1;
    for (int i = 1; i <= n; ++i) {
        f *= i;
        cout << i << "\t\t" << f << endl;
    }
    return 0;
}