> For the complete documentation index, see [llms.txt](https://kkishan114.gitbook.io/30-days-of-code/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://kkishan114.gitbook.io/30-days-of-code/index/day-0-hello-world-solution.md).

# Day 0: Hello, World.

### Problem Link <a href="#problem" id="problem"></a>

* [x] [**HackerRank Problem Link**](https://www.hackerrank.com/challenges/30-hello-world/problem)

### Solution

* [x] **In C++ Language**

{% code title="Hello\_World.cpp" %}

```cpp
#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;
int main() {
    // Declare a variable named 'input_string' to hold our input.
    string input_string; 
    
    // Read a full line of input from stdin (cin) and save it to our variable, input_string.
    getline(cin, input_string); 
    
    // Print a string literal saying "Hello, World." to stdout using cout.
    cout << "Hello, World." << endl;

    // TODO: Write a line of code here that prints the contents of input_string to stdout.
    

    return 0;
}
```

{% endcode %}