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Before adding sketches and graphics to the slides, which you ll do in s 7 and 8, it s a good idea to rehearse the presentation with only the headlines on the slides You might be more comfortable rehearsing alone at this stage, or you could rehearse with your team if you prefer to get some early feedback To start, nd a place to rehearse either at your desk or in a conference room Try to be aware of what you re doing with your body in relation to the computer and the screen Stand up to put yourself in a public speaking mode If you use a remote control device, hold it in the palm of your nondominant hand so that you can advance the slides discreetly Press the F5 key to begin the presentation from the rst slide.

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You get the following results:

On square 1 are 1 grain(s) On square 2 are 2 grain(s) On square 3 are 4 grain(s) On square 4 are 8 grain(s) On square 5 are 16 grain(s) On square 6 are 32 grain(s) On square 7 are 64 grain(s) On square 8 are 128 grain(s) [Results for squares 9 through 61 trimmed for brevity..] On square 62 are 2305843009213693952 grain(s) On square 63 are 4611686018427387904 grain(s) On square 64 are 9223372036854775808 grain(s)

Imagine the audience is in the room, and turn to face them From the corner of your eye, glance at the rst headline that appears on the screen, using it as a prompt to remind you what you wrote in the notes area When you ve nearly nished explaining what you want to say while that slide is displayed, discreetly advance to the next slide while you transition to the next topic with your spoken words, as prompted by the headline on the new slide Move your body around the room in a natural way when you want to emphasize a point or indicate your enthusiasm Be aware of where you stand in relation to the screen avoid being blinded by the light of the projector or standing in front of the projected image.

By square 64, you re up to placing many trillions of grains of rice on each square! The story ends with the king realizing his position and unable to fulfill his promise. However, it proves that Ruby is able to deal with extremely large numbers, and unlike many other programming languages, there are no inconvenient limits. Other languages often have limitations on the size of numbers that can be represented. Commonly this is 32 binary bits, resulting in a limit on values to roughly 4.2 billion in languages that enforce 32-bit integers. Most operating systems and computer architectures also have similar limitations. Ruby, on the other hand, seamlessly converts

In Windows, the suffix (.py) is the key to making your script behave like a program. Try doubleclicking the file hello.py you saved in the previous section. If Python was installed correctly, a DOS window appears with the prompt What is your name Cool, huh (You ll see how to make your programs look better, with buttons, menus, and so on later.) There is one problem with running your program like this, however. Once you ve entered your name, the program window closes before you can read the result. The window closes when the program is finished. Try changing the script by adding the following line at the end: raw_input("Press <enter>") Now, after running the program and entering your name, you should have a DOS window with the following contents: What is your name Gumby Hello, Gumby! Press <enter> Once you press the Enter key, the window closes (because the program is finished). Just as a teaser, rename your file hello.pyw. (This is Windows-specific.) Double-click it as before. What happens Nothing! How can that be I will tell you later in the book I promise.

between numbers that the computer can handle natively (that is, with ease) and those that require more work. It does this with different classes, one called Fixnum that represents easily managed smaller numbers, and another, aptly called Bignum, that represents big numbers Ruby needs to manage internally. On most systems, the boundary is the number 1,073,741,823 you can find it by experimenting in irb: