Hello World¶

Concept Explanation¶

The "Hello World" program is a classic introductory example in programming. Its primary purpose is to demonstrate the basic syntax of a programming language and how to display output to a console or screen. It's often the very first program a beginner writes, serving as a simple check that their development environment is correctly set up.

Algorithm¶

Start.
Print the string "Hello World" to the standard output.
End.

Implementations¶

JavaPythonCOracle

class HelloWorld {
    public static void main(String[] args) {
        System.out.println("Hello World");
    }
}

print("Hello World")

#include <stdio.h>

int main() {
    printf("Hello World"); // Added for consistency with other languages' default behavior
    return 0;
}

-- SQL Implementation
SELECT 'Hello World' FROM DUAL;

-- PL/SQL Implementation
SET SERVEROUTPUT ON;
BEGIN
  DBMS_OUTPUT.PUT_LINE('Hello World');
END;
/

Explanation¶

Java: Uses System.out.println() within a public static void main method inside a class. Java is object-oriented, requiring code within classes.
Python: Employs the concise print() function. Python is known for its readability and simpler syntax for common tasks.
C: Utilizes printf() from the stdio.h library within the main function. C requires explicit inclusion of header files for I/O operations and traditionally returns an integer from main. A has been added for a newline.
Oracle: Can be implemented using a simple SELECT statement in SQL or within a PL/SQL anonymous block using DBMS_OUTPUT.PUT_LINE. SET SERVEROUTPUT ON; is required in SQL*Plus/SQL Developer to display DBMS_OUTPUT messages.

Flowchart¶

graph TD
    A[Start] --> B[Initialize Program Setup]
    B --> C[Print Hello World]
    C --> D[End Program]

Practice Problems¶

Modify the "Hello World" program to print your name instead of "Hello World".
Print "Hello World" five times on separate lines.

"The only way to do great work is to love what you do." - Steve Jobs