Questions and Answers Easy Questions and Answers

Questions and Answers

How many items are there in sequence container?

Correct Option: A

There are five items in sequence container. They are array, vector, list, forward_list and dequeue.

Which is optional in the declaration of vector?

Correct Option: A

The number of elements is optional. An empty vector means, A vector that contains zero elements.

Pick out the correct statement about vector.

Correct Option: C

The syntax for declaring the vector element is vector<type> variable_name (number_of_elements);

What is the output of this program?

#include <iostream>
    #include <vector>
    using namespace std;
    int main ()
    {
        vector<int> VectorData (6);
        int* ptr = VectorData.data();
        *ptr = 30;
        ++ptr;
        *ptr = 15;
        ptr[2] = 150;
        for (unsigned k = 0; k < VectorData.size(); ++k)
            cout << ' ' << VectorData[k];
        return 0;
    }

Correct Option: A

In this program, We are allocating the values to the vector and unallocated values are left as zero.

What is the output of this program?

#include <iostream>
    #include <vector>
    using namespace std;
    int main ()
    {
        vector<int> Data;
        Data.assign (5,50);
        vector<int>::iterator iter;
        iter=Data.begin()+1;
        int Array[] = {1200,20,40};
        cout << int (Data.size()) << '\n';
        return 0;
    }

Correct Option: A

In this program, We are finding the size of the vector elements and resizing it.