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In many instances, you might want to switch out of PowerPoint and into another software application to demonstrate an activity. For example, an instructor would switch over to Of ce Excel to demonstrate how to use one of its features, or to Of ce Word to show how to edit a document. The Explanation headline on the upper-left slide in Figure 7-25 reads First, we closely watch and listen to the market and analyze it. Here you can sketch an additional graphic or use the headline alone by clicking on the title box in Normal view and dragging it to the center of the screen.

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You re going to use nested classes in a project at the end of this chapter, where you ll see how they work in the scope of an entire program.

In 3 you looked at constants: special variables whose value(s) are unchanging and permanent throughout an application, such as Pi = 3.141592. Here s an example:

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def circumference_of_circle(radius) 2 * Pi * radius end Pi = 3.141592 puts circumference_of_circle(10)

If you want to check for several conditions, you can use elif, which is short for else if. It is a combination of an if clause and an else clause an else clause with a condition: num = input('Enter a number: ') if num > 0: print 'The number is positive' elif num < 0: print 'The number is negative' else: print 'The number is zero'

31.41592 In this sense, a constant appears to work like a global variable, but it s not. Constants are defined within the scope of the current class and are made available to all child classes, unless they re overridden. For example:

FIGURE 7-25 An Explanation slide showing where you ll switch to another software program. The Detail

Pi = 3.141592 class OtherPlanet Pi = 4.5 def OtherPlanet.circumference_of_circle(radius) radius * 2 * Pi end end puts OtherPlanet.circumference_of_circle(10)

This example demonstrates that constants have scope within the context of classes. The OtherPlanet class has its own definition of Pi. However, if you hadn t redefined it there, the original Pi would have been available to OtherPlanet, as the OtherPlanet class is defined within the global scope. The second section of the preceding example also demonstrates that you can interrogate constants within other classes directly. OtherPlanet::Pi refers directly to the Pi constant within OtherPlanet.

The three Detail slides could easily be illustrated with a live demonstration of the technical feeds (upper right), a review of the actual analysis model (lower left), and a tour of the account page features (lower right) sketch a note to that effect on each slide, as shown in Figure 7-25. Next click the rst Detail slide and hold down the Ctrl key as you select the second and third Detail slides, and then right-click and select Hide Slide. Now the audience will not see the three hidden slides, but you know in the planning phase that the headlines are there to guide the points you will make over the next three minutes. During the presentation, when you arrive at the Explanation slide (upper left), verbally explain the point of the headline. When you re ready to switch to the rst live demonstration, hold down the Alt key while you press the Tab key, and then in the window that