Day 0 Hello World Solution | 30 Days of Code

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We are going to solve HackerRank “30 Days of Code” programing problem day 0 hello world HackerRank solution in C, C++, and Java language with complete code, logic explanation, output, and example. 30 days of code solution are given by a very famous website HackerRank, you have to solve a daily day0 to day30, total 30 programming problems in any language, most popular programming problem are C, C++, Java, and Python.

Day 0 Hello World HackerRank Solution- Table of Content

  • Task
  • Input Format
  • Output Format
  • Sample Input
  • Sample Output
  • Explanation
  • How to Use this Solution
  • Hello World Solution in C
  • HackerRank Hello World Solution in C++
  • Hello World Solution in Java
  • Output


Day 0 Hello World HackerRank Solution, To complete this challenge, you must save a line of input from stdin to a variable, print Hello, World. on a single line, and finally, print the value of your variable on a second line.

You’ve got this!

Note: The instructions are Java-based, but we support submissions in many popular languages. You can switch languages using the drop-down menu above your editor, and the inputString variable may be written differently depending on the best-practice conventions of your submission language.

Input Format

A single line of text denoting inputString(the variable whose contents must be printed).

Output Format

Print Hello, World. on the first line, and the contents of inputString on the second line.

Sample Input

Welcome to 30 Days of Code!

Sample Output

Hello, World.
Welcome to 30 Days of Code!


On the first line, we print the string literal Hello, World. On the second line, we print the contents of the inputString variable which, for this sample case, happens to be Welcome to 30 Days of Code!. If you do not print the variable’s contents to stdout, you will not pass the hidden test case. Visit: HackerRank.

How to Use this Solution

Visit to the hacker rank 30 days of code challenge page and open day 0 “hello world” programming problem, in the below solution code there is a code between /* solution starts from here */ and /* solution ends here */ just copy the code and paste it to the hacker rank editor and click on submit button.

Hello World HackerRank Solution in C

#include <stdio.h>
#include <string.h>
#include <math.h>
#include <stdlib.h>

int main() 
    /* Declare a variable named 'input_string' to hold our input.*/
    char input_string[105]; 
    /* Read a full line of input from stdin and save it to our variable, input_string.*/
    scanf("%[^\n]", input_string); 
    /* Print a string literal saying "Hello, World." to stdout using printf.*/
    printf("Hello, World.\n");
    /* TO DO: Write a line of code here that prints the contents of input_string to stdout.*/
	/* Solution starts from here */
    /* Solution ends here */
	return 0;

HackerRank Hello World in C++

#include <iostream>
using namespace std;

int main() 
    string inputString;
    /* get a line of input from cin and save it to our variable*/
    getline(cin, inputString); 

    /* Your first line of output goes here*/
    cout << "Hello, World." << endl;

    /* Write the second line of output*/
	/* Solution starts from here */
	cout << inputString << endl;
    /* Solution ends here */
    return 0;

Hello World HackerRank in Java

import java.util.Scanner;

public class HelloWorld {
    public static void main(String[] args) 
        /* Create a Scanner object to read input from stdin.*/
        Scanner scan = new Scanner(;

        /* Read a full line of input from stdin and save it to our variable, inputString.*/
        String inputString = scan.nextLine();

        /* Close the scanner object, because we've finished reading
        all of the input from stdin needed for this challenge.*/

        /* Print a string literal saying "Hello, World." to stdout.*/
        System.out.println("Hello, World.");

        /* Print the contents of inputString to stdout.*/
		/* Solution starts from here */
		/* Solution ends here */

Output HackerRank “Hello World”

HackerRank 30 Days of Code

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