C++ miscellaneous MCQ question and answer with solution | C++ Programimg MCQs

#include <iostream>
using namespace std;
int main()
{
    int age=5;
    try 
    {
        if (age < 0)
            throw "Positive Number Required";
        cout  << age << "\n\n";
    }
    catch(const char* Message)
    {
        cout << "Error: " << Message;
    }
    return 0;
}

#include<iostream>
#include<any>
#include<string>
using namespace std;
int main()
{
	string s = "Hello World";
	any var(s);
	cout<<any_cast<char*>(var)<<endl;
	return 0;
}

#include <iostream>
#include <cctype>
using namespace std;
int main(int argc, char const *argv[])
{
    char arr[12] = "Hello World";
    for(int i=0;i<12;i++)
    {
	cout<<(bool)isalpha(arr[i]);
    }
}

#include <iostream>
using namespace std;
class Car
{
    public:
    int speed;
};
int main()
{
    int Car :: *pSpeed = &Car :: speed;
    Car c1;
    c1.speed = 1;           
    cout << c1.speed << endl;
    c1.*pSpeed = 2;     
    cout  << c1.speed << endl;
    return 0;
}

#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;
int main () 
{
    int myints[] = {10, 20, 30, 30, 20, 10, 10, 20};
    vector<int> v(myints, myints + 8);
    sort (v.begin(), v.end());
    vector<int> :: iterator low, up;
    low = lower_bound (v.begin(), v.end(), 20);
    up = upper_bound (v.begin(), v.end(), 20);
    cout << (low - v.begin()) << ' ';
    cout << (up - v.begin()) << '\n';
    return 0;
}