2667. Create Hello World Function - Detailed Explanation

Problem Statement

Task:
Implement a function named helloWorld() that, when called, prints the string "Hello World" to the console (standard output).

Examples:

1. Example 1

   • Input: (No input; just a function call)
   • Operation: Call helloWorld()
   • Output:

     Hello World
     

   • Explanation: When the function is executed, it outputs the exact string "Hello World".

2. Example 2

   • Input: (No input; just a function call)
   • Operation: Call helloWorld()
   • Output:

     Hello World
     

   • Explanation: Each call to the function should result in printing "Hello World" exactly once.

3. Example 3

   • Input: (No input; consider multiple calls)
   • Operation: Call helloWorld() two times consecutively.
   • Output:

     Hello World
     Hello World
     

   • Explanation: If you call the function twice, it prints "Hello World" on two separate lines, once per call.

Constraints:

• There are no input constraints because the function takes no parameters.
• The output must match exactly "Hello World", including the capitalization and the space between "Hello" and "World".

Hints Before the Solution

1. Hint 1: Think about the basic operation you need: printing a string to the console. In most programming languages, there is a simple command or function to do this (for example, print() in Python or System.out.println() in Java).

2. Hint 2: Make sure your function does nothing more than printing the required string. Pay attention to the exact text (no extra spaces or newline characters unless specified).

Approach 1: Direct Printing (Brute Force)

In this approach, the function is defined to perform exactly one operation: printing the string "Hello World".

Since the problem doesn’t require processing any inputs or handling any logic, you simply call the built-in print function (like print() in Python or System.out.println() in Java) to output the desired text.

Step-by-Step Explanation

1. Function Definition:
   You start by defining a function named helloWorld() with no parameters.

2. Printing the Message:
   Inside the function, you use the built-in output method to print "Hello World". This line is the core of the solution.

3. Execution:
   When you call the function (typically in your main block or method), it executes the print statement, and you see the output.

Benefits

• Simplicity:
  Fewer lines of code mean there’s less chance for mistakes.
• Clarity:
  The function’s purpose is immediately obvious—no extra logic distracts from the task.
• Direct Mapping:
  It directly maps the requirement (print the message) to the code implementation.

Visual Flow

Define helloWorld() → Call print("Hello World") → Output "Hello World"

Approach 2: Using a Helper Function (Alternative Variation)

Instead of directly printing the message, you could create a helper function whose sole responsibility is to return the string "Hello World". Then, the main function can handle the printing.

This approach separates the logic of generating the output from the act of printing it. It’s an example of how you might structure your code for larger, more complex applications.

Step-by-Step Explanation

1. Helper Function Creation:
   Create a function (e.g., getHelloWorld()) that returns the string "Hello World".

2. Primary Function:
   The helloWorld() function calls the helper function and then prints its result.

3. Execution:
   In the main block, when you call helloWorld(), it internally calls the helper to get the message and then prints it out.

Benefits

• Reusability:
  The helper function can be reused in other parts of the code if you need the string "Hello World" without immediately printing it.

• Testing and Maintenance:
  You can write separate tests for the helper function and the printing function, which is beneficial in larger systems.

• Flexibility:
  This structure allows you to add more logic to the helper function later (for example, modifying the greeting dynamically) without changing the overall design.

Visual Flow

Define getHelloWorld() → Return "Hello World"
Define helloWorld() → Call getHelloWorld() → Print returned value → Output "Hello World"

Step-by-Step Walkthrough

1. Step 1: Define the function helloWorld() with no parameters.

2. Step 2: Inside the function, use the language’s print statement to output the string "Hello World".

3. Step 3: (For demonstration) Create a main function or a main method that calls helloWorld() so you can see the output when running the code.

4. Step 4: Run the program and verify that the output is exactly as required.

Visual Example:

+---------------------+
|   helloWorld()      |  <-- Function call
+----------+----------+
           |
           v
+---------------------+
| Print: "Hello World"|
+---------------------+

Python Code