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

#include  <iostream>
using namespace std;
int main()
{
    double arr[] = {5.0, 6.0, 7.0, 8.0};
    double *p = (arr+2);
    cout << *p << endl;   
    cout << arr << endl;  
    cout << *(arr+3) << endl;
    cout << *(arr) << endl;  
    cout << *arr+9 << endl;  
    return 0;
}

#include <iostream>
#include <string>
using namespace std;
class B
{
	int b;
    public:
	B(){}
	B(int i){
		b = i;
	}
	int show(){
		return b;
	}
};
 
class C
{
	B b;
    public:
	C(int i){
		b = B(i);
	}
	friend void show(){
 
		C c(10);
		cout<<"value of b is: "<<c.b.show()<<endl;
	}
};
 
int main(int argc, char const *argv[])
{
	C c(1);
	c.show();
	return 0;
}

way 1:
string s;
s = s + 'a';
 
way 2:
string s;
s.push_back('a');

#include <iostream> 
#include <string>
using namespace std; 
int main(int argc, char const *argv[])
{
	string s1 = "Hello";
	string s2 = "World";
	string s3 = s1 + " " + s2;
	cout<<s3;
	return 0;
}