String Data Structure Quiz for Beginners

Question 1

What is the output of the following code?

C++

#include <iostream>
using namespace std;

int main()
{

    string str1 = "Hello";
    string str2 = "Geeks";
    string str3 = str1 + str2;
    cout << str3 << endl;

    return 0;
}

• Hello +  Geeks

• str1 + str2

• Hello Geeks

• HelloGeeks

Question 2

What is the output of the following code?

C++

#include <iostream>
using namespace std;

int main()
{

    string str = "Hello";
    cout << str.substr(2, 5);
    return 0;
}

• Syntax error

• ello

• llo

• None

Question 3

What is the output of the following code?

C++

#include<bits/stdc++.h> 
using namespace std;

int main()
{
    // Write C++ code here
    char str_array2[] = "Geeks";
    cout << sizeof(str_array2) << " ";
    char str_array[] = { 'G', 'e', 'e', 'k', 's'};
    cout << sizeof(str_array);
    return 0;
}

• 6, 6

• 5, 6

• 6, 5

• None

Question 4

If two string s are identical, then strcmp() functions returns ______

• -1

• 1

• YES

• 0

Question 5

How will you print "\\\n" on the screen?

•   cout << "\\\n";

• cout<<"\\\\\n";

• cout<<"//n";

• cout<<"///n"

Question 6

What will the output of the following questions:

C++

#include <bits/stdc++.h>
using namespace std;

int main()
{

    string a = "Hello";
    string b = "World";
    string c = b.append(a);
    cout << c << endl;

    return 0;
}

• Hello world

• World hello

• WorldHello

• Error

Question 7

What is missing in the given code?

C++

#include <bits/stdc++.h>
using namespace std;

void reverseStr(string& str)
{

    for (int i = 0; i < n / 2; i++)
        swap(str[i], str[n - i - 1]);
}

// Driver program
int main()
{
    string str = "geeksforgeeks";
    reverseStr(str);
    cout << str;
    return 0;
}

• swap function is not defined

• string is not defined here.

• Variable n is not declared anywhere.

• None

Question 8

What is the function present to sort a string in C++?

• sort();

•  sort(str.begin(), str.end());

• Sort_asec();

• None

Question 9

What is the below image explaining?

• The image is about the substring of a string

• The image is about the subsequence of a string

• The image is about arrays.

• None

Question 10

What is a palindromic string?

• The string of length 0 

• The string of having a special character.

• The string of having an uppercase letter

• The string whose reversed string is equal to the original string.