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

#include <iostream>
#include <limits>
using namespace std;
int main () 
{
    cout << boolalpha;
    cout << numeric_limits<int> :: has_infinity << '\n';
    return 0;
}

#include <iostream>
using namespace std;
int add(int a, int b);
int main()
{
    int i = 5, j = 6;
    cout << add(i, j) << endl;
    return 0;
}
int add(int a, int b )
{
    int sum = a + b;
    a = 7;
    return a + b;
}

#include <iostream>
#include <Valarray>
using namespace std;
int main()
{
	Valarray<int> varr = { 1, 2, 3, 4, 5 };
	for (int &x: varr) cout << x << " ";
	cout<<endl;
	varr = varr.shift(-3);
	for (int &x: varr) cout << x << " ";
	return 0;
}

#include <iostream> 
#include <vector> 
 
using namespace std; 
 
int main() 
{ 
    vector<int> v; 
    for (int i = 1; i <= 5; i++) 
        v.push_back(i);
    int *pos = v.data();
    cout<<*(pos + 3);
    return 0; 
}