String Data Structure Quiz for Beginners

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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

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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

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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

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Question 4

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

  • -1

  • 1

  • YES

  • 0

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Question 5

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

  •   cout << "\\\n";

  • cout<<"\\\\\n";

  • cout<<"//n";

  • cout<<"///n"

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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

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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

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Question 8

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

  • sort();

  •  sort(str.begin(), str.end());

  • Sort_asec();

  • None

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Question 9

What is the below image explaining?

Subsequences-of-a-String-768x433-(1)


  • The image is about the substring of a string

  • The image is about the subsequence of a string

  • The image is about arrays.

  • None

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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.

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There are 20 questions to complete.

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