Standard Template Library (STL) in C++ MCQ question and answer with solution | C++ Programimg MCQs

#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;
int main ()
{
    int first[] = {5, 10, 15, 20, 25};
    int second[] = {50, 40, 30, 20, 10};
    vector<int> v(10);      
    vector<int> :: iterator it;
    sort (first, first + 5);   
    sort (second, second + 5); 
    it = set_union (first, first + 5, second, second + 5, v.begin());
    cout << int(it - v.begin());
    return 0;
}

#include <stdio.h>    
#include <stdlib.h>   
int main ()
{
    int n, m;
    n = abs(23);
    m = abs(-11);
    printf ("%d", n);
    printf ("%d", m);
    return 0;
}

#include <stdio.h>
#include <math.h>
int main ()
{
    double param, result;
    param = 5.5;
    result = log (param);
    printf ("%lf", result );
    return 0;
}