OPL

In order to write “Hello World!” using the OPL (Object-Oriented Programming Language) programming language, you would follow these steps:

1. Open your preferred text editor or IDE with support for OPL.
2. Create a new file and save it as “hello_world.opl” (or any other desired name).
3. Type the following code:

   class HelloWorldApp {
   
    method main() {
       print("Hello World!");
    }
   }
   
   module main {
     include HelloWorldApp;
     new(HelloWorldApp).main();
   }
   

This code creates a simple class with a “main” method that prints the string “Hello World!” to the console when run. The “main” module includes the HelloWorldApp class and executes its main() method, which will display your desired message. Save the file and run it using your IDE or command prompt by following the instructions for the OPL platform you are using.

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