Algorithm
Problem Name: 30 days of code -
Objective
In this challenge, we review some basic concepts that will get you started with this series. You will need to use the same (or similar) syntax to read input and write output in challenges throughout HackerRank. Check out the Tutorial tab for learning materials and an instructional video!
Task
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
variable may be written differently depending on the best-practice conventions of your submission language.
Input Format
A single line of text denoting
(the variable whose contents must be printed).
Output Format
Print Hello, World. on the first line, and the contents of
on the second line.
Sample Input
Welcome to 30 Days of Code!
Sample Output
Hello, World.
Welcome to 30 Days of Code!
Explanation
On the first line, we print the string literal Hello, World.. On the second line, we print the contents of the
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.
Code Examples
#1 Code Example with C Programming
Code -
C Programming
#include <stdio.h>
#include <string.h>
#include <math.h>
#include <stdlib.h>
int main() {
char inputString[105]; // declare a variable to hold our input
scanf("%[^\n]", inputString); // get a line of input from stdin and save it to our variable
// Your first line of output goes here
printf("Hello, World.\n");
// Write the second line of output
printf("%s", inputString);
return 0;
}
Input
Output
Welcome to 30 Days of Code!
#2 Code Example with C++ Programming
Code -
C++ Programming
#include<iostream>
using namespace std;
int main() {
string inputString; // declare a variable to hold our input
getline(cin, inputString); // get a line of input from cin and save it to our variable
// Your first line of output goes here
cout << "Hello, World." << endl;
// Write the second line of output
cout << inputString << endl;
return 0;
}
Input
Output
Welcome to 30 Days of Code!
#3 Code Example with C# Programming
Code -
C# Programming
using System;
class Solution
{
static void Main(String[] args)
{
// Declare a variable named 'inputString' to hold our input.
String inputString;
// Read a full line of input from stdin and save it to our variable, inputString.
inputString = Console.ReadLine();
// Print a string literal saying "Hello, World." to the stdout.
Console.WriteLine("Hello, World.");
// Prints the contents of inputString to stdout.
Console.WriteLine(inputString);
}
}
Input
Output
Welcome to 30 Days of Code!
#4 Code Example with Java Programming
Code -
Java Programming
import java.util.Scanner;
public class Solution {
public static void main(String[] args) {
// Create a Scanner object to read input from stdin.
Scanner scan = new Scanner(System.in);
// 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.
scan.close();
// Print a string literal saying "Hello, World." to stdout.
System.out.println("Hello, World.");
// Print the contents of inputString to stdout.
System.out.println(inputString);
}
}
Input
Output
Welcome to 30 Days of Code!
#5 Code Example with Javascript Programming
Code -
Javascript Programming
function processData(inputString) {
// This line of code prints the first line of output
console.log("Hello, World.");
// Write the second line of output that prints the contents of 'inputString' here.
console.log(inputString);
}
Input
Output
Welcome to 30 Days of Code!
#6 Code Example with Python Programming
Code -
Python Programming
# Read a full line of input from stdin and save it to our dynamically typed variable, input_string.
input_string = input()
# Print a string literal saying "Hello, World." to stdout.
print('Hello, World.')
print(input_string)
# TODO: Write a line of code here that prints the contents of input_string to stdout.
Input
Output
Welcome to 30 Days of Code!
Demonstration
[Solved] Day 0: Hello, World solution in Hackerrank - Hacerrank solution C, C++, C#, java, Js, Python in 30 days of code, Let's solve hackerrank problem solution in c, c++, java, javascript, python, php and so on