vb.net barcode reader from webcam THE ROBOTBASIC IDE in Software

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THE ROBOTBASIC IDE
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FIGURE A.6 The Help Screen.
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A.3 The Help Screen
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The Help Screen (Fig. A.6) provides explanations about the use of RobotBASIC s commands, functions, and various other aspects of the entire system. The screen has a dropdown combo-box that contains a title heading for all the help pages from which you can choose. These pages cover every aspect of the system and closely parallel Apps. A, B, C, and D. The help text can be selected and copied to the Windows clipboard using the button or Ctrl+C. The button (or Ctrl+F ) allows you to search the text in the currently displayed section.
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A.4 The Debugger Screen
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The debugging feature of RobotBASIC is discussed in detail in Sec. C.7. The buttons are self-explanatory. Refer to the Debug command in Sec. C.7 for more detailed information. The Debugger Screen (Fig. A.7) buffer will become full if there is too much output. To prevent this from causing an error use the Clear button occasionally to clear the buffer.
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APPENDICES
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FIGURE A.7 The Debug Screen.
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You can resize and move the Debug Screen, and you can swap between it, the Terminal Screen, and the Editor Screen. Be careful not to lose it behind other windows. You can always drag it to the side while viewing other windows. If you happen to lose the debugger window under other windows, you can bring it back to the top by using the menu option Bring Up Debug from the Run menu on the Editor Screen, or you can use Ctrl+D while in the Editor Screen.
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APPENDIX
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THE ROBOTBASIC LANGUAGE
obotBASIC is a line-oriented programming language. A program is a set of lines, where each line is either a blank line or a program statement. A line ends at the end of the line. In more technical jargon, a line ends with a CR+LF (Carriage Return + Line Feed). So a program is a collection of statements as shown in Fig. B.1.
NOTE:
Always refer to the help pages within the RobotBASIC IDE for the most upto-date information regarding material mentioned in this appendix.
B.1 Statements
A statement is what makes a RobotBASIC program achieve the tasks it is designed to accomplish. There are various types of statements:
Assignment statements Command statements Flow-control statements
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APPENDICES
Statement Statement Statement Statement Statement ...
FIGURE B.1 A program is a collection of statements.
Labels
Comments
Labels and comments can be combined on the same line with other statements (see below). A statement contains various other elements that help in achieving the functionality of the statement. These elements are:
Simple variables Array variables Expressions, which contain further elements that constitute the expression. These elements are: variables Simplevariables Array Constants Strings Numbers, which are of the following types: Integer numbers Floating-point numbers Operators, which are of the following types: Parenthesis Mathematical operators Comparison (relational) operators Logical operators Bitwise operators Functions, which can contain expressions
B.2 Comments
Comments are an important part of any programming language. Without good comments a program can be hard to understand. Without good comments, even the person who wrote the program may not be able to follow the program s logic when reading the program at a later time. Comments are not executable statements. They are used to annotate a program and format the text of the program to look nice and make the logic of the program
THE ROBOTBASIC LANGUAGE
understandable by someone trying to read the program. Comments can also divide the program into sections, making it easy to see where the various operations begin and end. Comments can be in a line of their own, or they can be inline with a statement. Any text in a line after and including the comment indicator will be ignored and is not considered part of the statement. RobotBASIC allows for two methods of indicating a comment. The character combination // is one and the character is another. For example:
//this is this too d = 9 b = d*2 a comment on a line by itself is another comment //this is a comment inline with a statement so is this comment
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