C++ MCQs with answers Page - 3

#include 
    using namespace std;
    int add(int p, int q);
    int main()
    {
        int n = 15, m = 16;
        cout << add(n, m) << endl;
        return 0;
    }
    int add(int p, int q )
    {
        int sum = p + q;
        p = 20;
        return p + q;
    }

#include 
    using namespace std;
    void square (int *p)
    {
	*p = (*p + 1) * (*p);
    }
    int main ( )
    {
	int n = 11;
        square(&n);
        cout << n; 
        return 0;
    }

#include 
    using namespace std;
    void function(int &p)
    {
        p = 15;
    }
    int main()
    {
         int p = 12;
         function(p);
         cout << "New value of P is " << p;
         return 0;
    }

#include 
    using namespace std;
    void copy (int& p, int& q, int& r)
    {
        p = p * 1;
        q = q * 2;
        r = r * 3;
    }
    int main ()
    {
        int m = 6, n = 3, o = 2;
        copy (m, n, o);
        cout << "M = " << m << ", N = " << n << ", O = " << o;
        return 0;
    }

#include <iostream>
    using namespace std;
    int main()
    {
        unsigned long num = 56;
        cout << num << oct <<" " << num << endl;
        return 0;
    }