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here s an old saying, That s like comparing apples to oranges. What it means is that it s sometimes unfair to compare dissimilar objects. I said sometimes, because at other times it s completely fair. Suppose I hand you one apple and one orange. Which one is heavier Which one has a larger diameter These aren t unfair questions, are they So sometimes you can compare apples to oranges! And when it comes to your robots, there s a way for your robots to compare things, too not apples and oranges but numbers.
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The COMPARE Block
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Remember that we discussed the concept of Logic back in 8 True or False (If you said False, you need to go back and read 8 again!) Well, NXT-G comes with a programming block called the COMPARE block that relies on your understanding of Logic. Suppose I ask you, Is 5 greater than 3 Your answer would be, Yes. When you program, the same question is given to a computer or robot in the form of a statement, 5 is greater than 3. This statement, to your robot, is either True or False. Similarly, if I ask you, Is the Earth square-shaped you would answer, No. A robot would not be asked this question, but instead told, The Earth is square-shaped. And it would respond with False. So, here s an important item to remember: robots respond to statements with True or False. Before I show you the COMPARE block, let s create a test program for SPOT using pseudocode: Me: SPOT, I want you to create two random numbers between 1 and 9 (number A and number B), show them on the LCD screen, and tell me if A is greater than B. To do this, we ll start by dropping two RANDOM blocks (see 14) on to the beam, as shown in Figure 15-1. I ve configured both RANDOM blocks with identical settings, as shown in the configuration panel.
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CHAPTER 15 APPLES AND ORANGES
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Figure 15-1. Two RANDOM blocks will generate numbers for comparison. Next, I ll convert them to text using two NUMBER TO TEXT blocks (see Figure 15-2). Review 14 for information on the NUMBER TO TEXT block.
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Figure 15-2. Convert the random numbers to Text. And before we get to the Compare block, I ll use a TEXT block to create a statement in the form of A greater than B, as shown in Figure 15-3.
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CHAPTER 15 APPLES AND ORANGES
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Figure 15-3. Create a text statement to be displayed on the LCD screen. As you can see from Figure 15-3, the first RANDOM block number is used as input in the second NUMBER TO TEXT block (the fourth block from the left). The second RANDOM block number is used as input in the first NUMBER TO TEXT block (the third block from the left). For the TEXT block, I have taken the first number (now converted to text) and used it as input to the A data plug. Also, I have taken the second number (now converted to text) and used it as input to the C data plug. I enter the words greater than in the B text box. This will create a single sentence (also called a statement): A greater than C (where A and C will be numbers between 1 and 9). I now send the combined text to a DISPLAY block configured to display Text on Line 3 with position X=2 and Y=40 (see Figure 15-4).
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Figure 15-4. The DISPLAY block will display a statement on the LCD screen. Now we re ready to see how the COMPARE block works. (Sorry it took so long to get here, but the COMPARE block by itself can t do anything we need a good example with things to compare to see it in action.) I m going to break off a new beam to run in parallel. To do this, I hold down the Shift key and drag an extra beam, shown in Figure 15-5.
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