Functions and Procedures in C++ MCQ question and answer with solution | C++ Programimg MCQs

#include <iostream>
using namespace std;
double & WeeklyHours()
{
    double h = 46.50;
    double &hours = h;
    return hours;
}
int main()
{
    double hours = WeeklyHours();
    cout << "Weekly Hours: " << hours;
    return 0;
}

#include <iostream>
using namespace std;
int add(int first, int second)
{
    return first + second + 15;
}
int operation(int first, int second, int (*functocall)(int, int))
{
    return (*functocall)(first, second);
}
int main()
{
    int  a;
    int  (*plus)(int, int) = add;
    a = operation(15, 10, plus);
    cout << a;
    return 0;
}

#include <iostream>
#include <stdarg.h>
using namespace std;
void fun(std::string msg, ...);
int main()
{
    fun("cPlusPlus", 1, 4, 7, 11, 0);
    return 0;
}
void fun(std::string msg, ...)
{
    va_list ptr;
    int num;
    va_start(ptr, msg);
    num = va_arg(ptr, int);
    num = va_arg(ptr, int);
    cout << num;
}

Content of h1.h
------------------------------------------------
h1.h
#include <iostream>
using namespace std;
int func(int a){
	cout<<"Multiplied by 2";
	return 2*a;
}
------------------------------------------------
 
Content of h2.h
------------------------------------------------
h2.h
#include <iostream>
using namespace std;
int func(int a){
	cout<<"divided by 2";
	return a/2;
}
------------------------------------------------

#include <iostream>
using namespace std;
int n(char, int);
int (*p) (char, int) = n;
int main()
{
    (*p)('d', 9);
    p(10, 9);
    return 0;
}
int n(char c, int i)
{
    cout << c <<  i;
    return 0;
}