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Before I show you the COMPARE block, let s create a test program for SPOT using pseudo-code: Me: SPOT, I want you to create two random numbers between one and nine (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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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.
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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. The TEXT block will allow you to enter up to three bits of text in the A, B, and C text fields shown in Figure 15-3. You can also submit text to one of those three text fields using data wires as I ve done with the NUMBER TO TEXT blocks (also shown in Figure 15-3).
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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 one and nine). 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.
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The COMPARE Block
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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Figure 15-5. An extra beam will be used to compare values. This parallel beam will let me compare value A to value B at the same time that the numbers are being converted to text. Remember, I want to check the statement A greater than B and determine if it is True or False, so not only do I want to put the statement on the screen, but I also need to determine whether A really is greater than B. The first thing I need to do is drop the COMPARE block onto the new beam, as shown in Figure 15-6.
Figure 15-6. The COMPARE block will check to see if value A is greater than value B.
CHAPTER 15 APPLES AND ORANGES
Notice in Figure 15-6 that the COMPARE block has two input data plugs. I ll take the original random numbers from the NUMBER TO TEXT blocks output Number data plugs and drag data wires into the two COMPARE block input data plugs.
Note Back in 14, I told you that the NUMBER TO TEXT block had an output Number data plug that could
be used to keep the number in Number format and not Text format. You ll use this ability now to send these original random numbers into the COMPARE block.
Carefully drag a data wire out of the second NUMBER TO TEXT block (the fourth one from the left) and into value A s input data plug. Do the same for the first NUMBER TO TEXT block (the third from the left) but drag this wire into value B s input data plug. This configuration is shown in Figure 15-7.
Note Sometimes NXT-G will try to fix your wiring to keep it from becoming a tangled mess. In Figure 15-7 you
might notice that the wires coming out of the RANDOM blocks have been split. This happened automatically for me, even after I dragged the wire out of the NUMBER TO TEXT block. After I released my mouse button to complete the wire, NXT-G changed it so the RANDOM block wire split.
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