Classes and Objects in C++ MCQ question and answer with solution | C++ Programimg MCQs

#include <iostream>
using namespace std;
int main()
{
    typedef int num;
    num a = 10, b = 15;
    num c = a + b + a - b;
    cout << c;
    return 0;
}

#include <iostream>
#include <string>
using namespace std;
class B
{
	int b;
   public:
	B(int i){
		b = i;
	}
};
 
class C
{
	B b;
    public:
	C(int i){
		b = B(i);
	}
	friend void show();
};
 
void show()
{
	C c(10);
	cout<<"value of b is: "<<c.b.b<<endl;
}
 
int main(int argc, char const *argv[])
{
	show();
	return 0;
}

#include <iostream>
#include <string>
using namespace std;
int main ()
{
    string str ("nobody does like this");
    string key ("nobody");
    size_t f;
    f = str.rfind(key);
    if (f != string::npos)
        str.replace (f, key.length(), "everybody");
    cout << str << endl;
    return 0;
}

---------------------------
Example class:
class A
{
	public:
		static int value;
}
---------------------------

#include <iostream>
using namespace std;
class myclass
{
    public:
    int i;
    myclass *operator->()
    {return this;}
};
int main()
{
    myclass ob;
    ob->i = 10; 
    cout << ob.i << " " << ob->i;
    return 0;
}