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For many people, the thought of public speaking inspires fear, not con dence The fear often comes from speakers not being comfortable with their story, with themselves, or with their level of preparedness You remove the elements that create fear by securing a strong story, extending your personality through the story, and rehearsing thoroughly along the way Your con dence comes shining through most clearly in the way you use the projected slides you designed After working with the PowerPoint le in Notes Page, Normal, and Slide Sorter views, you should be very comfortable with the material When you advance to a new slide in the presentation, that slide s headline will prompt you about what to say next The headline also addresses the audience in a conversational tone, making them feel relaxed and helping them to easily understand what you want to convey at that point.

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Ruby is an interpreted language, so to distribute Ruby programs you can simply distribute the source code files you ve written. Anyone else who has Ruby installed can then run the files in the same way that you do. This process of distributing the actual source code for a program is typically how most programs developed using a scripting language, such as Ruby, are shared, but more traditionally software has been distributed without the source code included. Popular desktop application development languages such as C and C++ are compiled languages whose source code is converted directly into machine code that runs on a certain platform. This software can be distributed by copying the resulting compiled machine code files, rather than the source, from machine to machine. However, this technique is not possible with Ruby, as there is currently no Ruby compiler available, so you have to distribute your source code in one sense or another for other people to be able to run your programs.

Note Later in this chapter we ll look at making the functionality of your Ruby programs available across

Next on the slide is the graphical element One of the bene ts of the BBP simpli ed design approach is that the slides are free of bullet points and excess clutter; instead, you show a meaningful headline illustrated by a simple graphic The goal of simple slides like these is to inspire interdependence between you and the audience By showing less on screen, you pique the audience s curiosity Next you answer the audience s questions about the slide with your spoken words, which you developed fully in the written explanation of each slide in the notes area You explain the meaning of the headline and graphic to the audience in your own natural voice These three basic elements headline, graphic, and your voice work together to create an implicit dialog that engages the audience.

a network. This technique does not require you to make your source code available, although it does require you to maintain a running copy of your program on a machine that s network accessible.

In this chapter, you ve learned several things about abstraction in general, and functions in particular: Abstraction. Abstraction is the art of hiding unnecessary details. You can make your program more abstract by defining functions that handle the details. Function definition. Functions are defined with the def statement. They are blocks of statements that receive values (parameters) from the outside world and may return one or more values as the result of their computation. Parameters. Functions receive what they need to know in the form of parameters variables that are set when the function is called. There are two types of parameters in Python, positional parameters and keyword parameters. Parameters can be made optional by giving them default values.

To see how you can distribute Ruby source code, let s take an example Ruby file and call it test.rb:

puts "Your program works!"

When you nish the thought at hand, you advance to the next slide and repeat the process in a steady ow that naturally continues the dialog With the new PowerPoint presentation, you ll gain the focused attention of the audience through your relaxed approach, interesting story, and engaging visuals Scan the room as you speak, making direct eye contact with audience members in every part of the room Watch their faces to see how they re responding to the presentation If people are dgeting or restless, you might need to turn up your enthusiasm and speaking level..

If you copy test.rb to another computer that has the Ruby interpreter installed on it, you can run the program directly with the Ruby interpreter as you would normally:

Your program works!