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

Q81

Open question

What are the containers?

Select an option to see the answer and solution.

Q82

Open question

What is the header file used for declaring the standard library algorithms?

Select an option to see the answer and solution.

Q83

Open question

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

#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;
int main () 
{
    int myints[] = {10, 20, 30, 30, 20, 10, 10, 20};
    int mycount = count (myints, myints + 8, 10);
    cout << "10 appears " << mycount << " times.\n";
    vector<int> myvector (myints, myints+8);
    mycount = count (myvector.begin(), myvector.end(), 20);
    cout << "20 appears " << mycount  << " times.\n";
    return 0;
}

Select an option to see the answer and solution.

Q84

Open question

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

#include <stdio.h>
#include <stdlib.h>
int main ()
{
    div_t divresult;
 
    divresult = div (38, 5);
    printf ("%d\n", divresult.rem);
    return 0;
}

Select an option to see the answer and solution.

Q85

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 (4);
    fill (myvector.begin(), myvector.begin() + 2, 3);
    fill (myvector.begin() + 1, myvector.end() - 1, 4);
    for (vector<int> :: iterator it = myvector.begin(); it != myvector.end(); ++it)
        cout << ' ' << *it;
    return 0;
}

Select an option to see the answer and solution.

Q86

Open question

What are Iterators?

Select an option to see the answer and solution.

Q87

Open question

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

#include <typeinfo>
#include <iostream>
using namespace std;
class Test
{
    public:
    Test();
    virtual ~Test();
};
int main()
{
    Test *ptrvar = NULL;
    try 
    {
        cout << typeid(*ptrvar).name() << endl;
    }
    catch (bad_typeid) 
    {
        cout << "The object is null" << endl;
    }
    return 0;
}

Select an option to see the answer and solution.

Q88

Open question

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

#include <iostream> 
#include <algorithm>
using namespace std;
int main () 
{
    int myints[] = {10, 20, 30, 30, 20, 10, 10, 20};  
    int* pbegin = myints;                      
    int* pend = myints + sizeof(myints) / sizeof(int);
    pend = remove (pbegin, pend, 20);      
    for (int* p = pbegin; p != pend; ++p)
        cout << ' ' << *p;
    return 0;
}

Select an option to see the answer and solution.

Q89

Open question

What is meant by vector in the container library contains?

Select an option to see the answer and solution.

Q90

Open question

How many macros are used by mathematical functions in the header file <cerrno>?

Select an option to see the answer and solution.

Q91

Open question

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

#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;
}

Select an option to see the answer and solution.

Q92

Open question

What are the Sequence Containers?

Select an option to see the answer and solution.

Q93

Open question

Which of the following is best to include under try block?

Select an option to see the answer and solution.

Q94

Open question

How many Associative Containers are provided by C++?

Select an option to see the answer and solution.

Q95

Open question

How many elements does a floating point number is composed of?

Select an option to see the answer and solution.

Q96

Open question

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

#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;
}

Select an option to see the answer and solution.

Q97

Open question

What is the Standard Template Library?

Select an option to see the answer and solution.

Q98

Open question

Which header file is required for manipulation of math functions in c++?

Select an option to see the answer and solution.

Q99

Open question

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

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

Select an option to see the answer and solution.

Q100

Open question

Pick out the correct method in the c++ standard library algorithm.

Select an option to see the answer and solution.

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

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