qr code generator c# source code Note RDoc doesn t process comments that are within methods, so your usual code comments are not in Visual C#.NET

Print QR-Code in Visual C#.NET Note RDoc doesn t process comments that are within methods, so your usual code comments are not

Note RDoc doesn t process comments that are within methods, so your usual code comments are not
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used in the documentation produced.
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Command-Line Options Like most command-line applications, including Ruby itself, you can give RDoc a number of options, as follows: --all: Usually RDoc processes only public methods, but --all forces RDoc to document all methods within the source files. --fmt <format name>: Produce documentation in a certain format (default is html, but xml, yaml, chm, and pdf are available under some configurations). --help: Get help with using RDoc s command-line options and find out which output formatters are available. --inline-source: Usually source code is shown using popups, but this option forces code to be shown inline with the documentation.
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--main <name>: Set the class, module, or file that appears as the main index page for the documentation to <name> (for example, rdoc --main MyClass). --one-file: Make RDoc place all the documentation into a single file. --op <directory name>: Set the output directory to <directory name> (default is doc).
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After any command-line options, rdoc is suffixed with the filename(s) of the files you want to have RDoc document. Alternatively, if you specify nothing, RDoc will traverse the current directory and all subdirectories and generate documentation for your entire project.
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Note RDoc supports many more command-line options than these, and they are all covered in RDoc s
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official documentation. Alternatively, run RDoc with rdoc --help at the command line to get a list of its options.
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Errors happen. It s unavoidable that programs you develop will contain bugs, and you won t immediately be able to see what the errors are. A misplaced character in a regular expression, or a typo with a mathematical symbol, can make the difference between a reliable program and one that constantly throws errors or generates undesirable output.
Exceptions and Error Handling
An exception is an event that occurs when an error arises within a program. An exception can cause the program to quit immediately with an error message, or can be handled by errorhandling routines within the program to recover from the error in a sensible way. For example, a program might depend on a network connection (the Internet, for example), and if the network connection is unavailable, an error will arise when the program attempts to use the network. Rather than brusquely terminating with an obscure error message, the code can handle the exception and print a human-friendly error message to the screen first. Alternatively, the program might have a mechanism by which it can work offline, and you can use the exception raised by trying to access an inaccessible network or server to enter that mode of operation instead.
raising exceptions
In Ruby, exceptions are packaged into objects of class Exception or one of Exception s many subclasses. Ruby has about 30 main predefined exception classes that deal with different types of errors, such as NoMemoryError, RuntimeError, SecurityError, ZeroDivisionError, and NoMethodError. You might have already seen some of these in error messages while working in irb.
Note A table of all of Ruby s standard exception classes is provided in Appendix B.
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When an exception is raised (exceptions are said to be raised when they occur within the execution of a program), Ruby immediately looks back up the tree of routines that called the current one (known as the stack) and looks for a routine that can handle that particular exception. If it can t find any error-handling routines, it quits the program with the raw error message. For example: irb(main):001:0> puts 10 / 0
ZeroDivisionError: divided by 0 from (irb):1:in `/' from (irb):1 This error message shows that an exception of type ZeroDivisionError has been raised, because you attempted to divide ten by zero. Ruby can raise exceptions automatically when you perform incorrect functions, and you can raise exceptions from your own code too. You do this with the raise method and by using an existing exception class, or by creating one of your own that inherits from the Exception class. One of the standard exception classes is ArgumentError, which is used when the arguments provided to a method are fatally flawed. You can use this class as an exception if bad data is supplied to a method of your own: class Person def initialize(name) raise ArgumentError, "No name present" if name.empty end end If you create a new object from Person and supply a blank name, an exception will be raised: fred = Person.new('')
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