Standard Template Library (STL) in C++ MCQs with Answers 2027

Q41

Open question

What is the purpose of the 'std::forward_list' container in C++ STL?

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Q42

Open question

Which algorithm in C++ STL is used to sort a range of elements using quicksort?

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Q43

Open question

What is the purpose of the 'std::array' container in C++ STL?

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Q44

Open question

Which algorithm in C++ STL is used to compute the sum of elements in a range?

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Q45

Open question

What will be the output of the following C++ code?

#include <stdio.h>
#include <math.h>
int main ()
{
    printf ("%lf\n", fmod (5.3, 2) );
    printf ("%lf\n", fmod (18.5, 4.2) );
    return 0;
}

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Q46

Open question

What will be the output of the following C++ code?

#include <typeinfo>
#include <iostream>
using namespace std;
class shape
{
    public:
    virtual void myvirtualfunc() const {}
};
class mytriangle: public shape
{
    public:
    virtual void myvirtualfunc() const
    {   
    };
};
int main()
{
    shape shape_instance;
    shape &ref_shape = shape_instance;
    try 
    {
        mytriangle &ref_mytriangle = dynamic_cast(ref_shape);
    }
    catch (bad_cast) 
    {
        cout << "Caught: bad_cast exception\n";
    }
    return 0;
}

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Q47

Open question

Which is best for coding the standard library for c++?

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Q48

Open question

Where are standard exception classes grouped?

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Q49

Open question

What will be the output of the following C++ code?

#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;
int main () 
{
    vector<int> myvector;
    for (int i = 1; i < 6; ++i) 
        myvector.push_back(i);
    reverse(myvector.begin(), myvector.end());
    for (vector<int> :: iterator it = myvector.begin(); it != myvector.end(); ++it)
        cout << ' ' << *it;
    return 0;
}

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Q50

Open question

How many parameters are used in frexp function?

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Q51

Open question

Pick out parameter for rehash method in unordered_set in c++?

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Q52

Open question

What are Container Adaptors?

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Q53

Open question

What are Unordered Associative Containers?

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Q54

Open question

How does the limits.h header file can be represented in C++?

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Q55

Open question

What will be the output of the following C++ code?

#include <iostream>
#include <vector>
using namespace std;
int main()
{
    vector<int> v;
    v.assign( 10, 42 );
    for (int i = 0; i < v.size(); i++) 
    {
        cout << v[i] << " ";
    }
}

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Q56

Open question

Pick out the wrong header file.

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Q57

Open question

What will be the output of the following C++ code?

#include <stdio.h>    
#include <stdlib.h>
int main ()
{
    char s[] = "365.24 29.53";
    char* p;
    double d1, d2;
    d1 = strtod (s, &p);
    d2 = strtod (p, NULL);
    printf ("%.2f\n", d1/d2);
    return 0;
}

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Q58

Open question

What will be the output of the following C++ code?

#include <iostream>
#include <list>
#include <queue>
using namespace std;
int main()
{
    queue<char> q;
    q.push('a');
    q.push('b');
    q.push('c');
    cout << q.front();
    q.pop();
    cout << q.front();
    q.pop();
    cout << q.front();
    q.pop();
}

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Q59

Open question

What will be the output of the following C++ code?

#include <list>
#include <string>
#include <iostream>
using namespace std ;
typedef list<string> LISTSTR; 
int main()
{
    LISTSTR :: iterator i;
    LISTSTR test;
    test.insert(test.end(), "one");
    test.insert(test.end(), "two");
    LISTSTR test2(test);
    LISTSTR test3(3, "three");
    LISTSTR test4(++test3.begin(),
    test3.end());
    cout << "test:";
    for (i =  test.begin(); i != test.end(); ++i)
        cout << " " << *i << endl;
    cout << "test:";
    for (i =  test2.begin(); i != test2.end(); ++i)
        cout << " " << *i << endl;
    cout << "test:";
    for (i =  test3.begin(); i != test3.end(); ++i)
        cout << " " << *i << endl;
    cout << "test:";
    for (i =  test4.begin(); i != test4.end(); ++i)
        cout << " " << *i << endl;
}

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Q60

Open question

What is the use of <exception> header

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Standard Template Library (STL) in C++practice.

Standard Template Library (STL) in C++
practice.