vb.net barcode scan event K = while K<> Q AND K<> q Print Random(1000) Waitkey K K = char(K) wend in Software

Printing Quick Response Code in Software K = while K<> Q AND K<> q Print Random(1000) Waitkey K K = char(K) wend

K = while K<> Q AND K<> q Print Random(1000) Waitkey K K = char(K) wend
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repeat Print Random(1000) Waitkey K K = char(K) until K= Q OR K= q
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Notice the condition for the while-wend loop and the repeat-until loop. They are exactly opposite. As a matter of fact, in Boolean algebra (the mathematics of logic) we know that:
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Not(X ) AND Not(Y ) = Not(X OR Y )
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This might be confusing but in English the while condition in the above example is the equivalent to keep looping while the user has not pressed the q button and not pressed the Q button. For the repeat loop the meaning is keep looping until the user presses q or Q . The method used for creating a loop depends on the logic of the algorithm you are using. You have seen, above, various methods, but there are many ways you can create a loop. It all depends on the logic you are trying to achieve. Refer to Secs. B.6 and C.6 for ow-control structures and Sec. B.7.5 for logical operators. 4.1.6 FUNCTIONS There are two ways to obtain a value in RobotBASIC, commands and functions. Commands tell the system to perform some action and given a variable name, the command will assign the variable a value depending on the action of the command (as you have seen in the WaitKey command above). Functions perform an action too, but after performing the action they act like a variable, taking on the value generated by the action. As you have seen in the discussion above the function Ascii( A ) returns the value 65 and you can use this number as if you have typed 65 in the statement. You can say
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y = Ascii( A )+3
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this will cause the number 68 to be stored in y just as if you typed
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y = 65+3.
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In RobotBASIC there are functions to obtain the length of a string, to convert a number to a string, to get the sine of an angle, and more. There are math functions, string functions, functions relating to the robot, and so on. Read Sec. B.7.7 for details about functions and Sec. C.8 for a list of functions. Some functions will be used in this chapter and many more throughout the book.
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4.2 Simple Remote Control
The rst two styles discussed in the beginning of the chapter will be implemented below. The advantage of the rst style is that you can easily control the robot accurately, but it is slow. The advantage of the second style is that the robot will move quickly and you do not have to keep the button pressed, but it is hard to control the robot with accuracy. 4.2.1 FIRST STYLE OF REMOTE CONTROL In this style the user will press
f or F to go forward l or L to turn left
b or B to go backward r or R to turn right
REMOTE CONTROL ALGORITHMS
The robot will move as required as long as the key is pressed. If the key is released the robot will stop moving. The robot will use data from its sensors and not go forward or backward if there are obstacles blocking the direction of travel even if you try to make it do so. In order to display the robot s current position and heading we will use the GPS and compass instruments described in Chap. 3. See Sec. C.9 if you need more details on the rGpsX(), rGpsY(), and rCompass() functions. The algorithm is in Fig. 4.1 (don t type the line numbers; they are only there for the discussion that follows). As you have seen from the previous section the WaitKey command is ideal here. We use the XYString command to display the data. We also use the drawing commands you saw in Chap. 2 to place some obstacles in the robot s environment. The function Char() used on Line 10 converts the key code to a character so that we can compare it to the characters used to control the robot. Notice how the values returned by the functions Char() and rBumper() are stored and then used in the ifstatements. This is more ef cient than if we were to call the function in each if-statement by saying:
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