C++ MCQs with answers Page - 4

#include <iostream>
    #include <iomanip>
    using namespace std;
    void showDate(int mm, int dd, int yy)
    {
        cout << setfill('0');
        cout << setw(2) << mm << '/'
        << setw(2) << dd << '/'
        << setw(4) << yy << endl;
    }
    int main()
    {
        showDate(1, 1, 2019);
        return 0;
    }

#include 
    using namespace std;
    long fact (long p)
    {
        if (p > 1)
            return (p * fact (p + 1));
        else
            return (1);
    }
    int main ()
    {
        long n = 6;
        cout << n << "! = " << fact ( n );
        return 0;
    }

#include 
    using namespace std;
    void square (int *p)
    {
	*p = (*p + 3) * (*p);
    }
    int main ( )
    {
	int n = 15;
        square(&n);
	cout << n;
	return 0;
    }

#include 
    using namespace std;
    int add(int p, int q);
    int main()
    {
        int k = 7, L = 9;
        cout << add(k, L) << endl;
        return 0;
    }
    int add(int p, int q )
    {
        int sum = p + q;
        p = 10;
        return p + q;
    }

#include 
    using namespace std;
    int main()
    {
        /* this is comment*\
        cout << "Uday";
        return 0;
    }