For example, in order for an HTML5 document to meet these criteria, the two requirements are that it must have an HTML5 doctype, and be written in well-formed XHTML. Such documents can be parsed as either HTML (which is SGML-compatible) or XML, and will produce the same DOM structure either way. Polyglot markup has been proposed as a useful combination of the benefits of HTML5 and XHTML. ![]() The following is written simultaneously in SNOBOL4, Win32Forth, PureBasicv4.x, and REBOL: SNOBOL4, Win32Forth, PureBasicv4.x, and REBOL In PHP the main function is defined but not called and in C there is no need to explicitly call the main function. The final three lines are only used by bash, to call the main function.printf is a bash shell builtin which is identical to the C printf except for its omission of brackets (which the C preprocessor adds if this is compiled with a C compiler)." if (($x))" is a valid statement in both bash and PHP.Comment indicators can be combined to perform various operations.The statement " function main()" is valid in both PHP and bash C #defines are used to convert it into " int main(void)" at compile time.Even on commented out lines, the " " PHP indicators still have effect.Shell redirection is used to eliminate undesirable outputs."//" is a comment in both PHP and C and the root directory in bash.A hash sign marks a preprocessor statement in C, but is a comment in both bash and PHP.Printf "Hello, world!\n"true/* 2> /dev/null | grep -v true*/ These are demonstrated in this public domain polyglot written in ANSI C, PHP and bash: Two commonly used techniques for constructing a polyglot program are to make use of languages that use different characters for comments, and to redefine various tokens as others in different languages. This is often accomplished by hiding language-specific constructs in segments interpreted as comments or plain text of the other format. To maintain validity across interpreting programs, one must ensure that constructs specific to one interpreter are not interpreted by another, and vice versa. For example, a PDF-Zip polyglot might be opened as both a valid PDF document and decompressed as a valid zip archive. A file is a valid polyglot if it can be successfully interpreted by multiple interpreting programs. Construction Ī polyglot is composed by combining syntax from two or more different formats, leveraging various syntactic constructs that are either common between the formats, or constructs that are language specific but carrying different meaning in each language. ![]() In the 21st century, polyglot programs and files gained attention as a covert channel mechanism for propagation of malware. In 2000, a polyglot program was named a winner in the International Obfuscated C Code Contest. A notable early example, named simply polyglot was published on the Usenet group rec.puzzles in 1991, supporting 8 languages, though this was inspired by even earlier programs. Click Apply and OK in the Sound window.Polyglot programs have been crafted as challenges and curios in hacker culture since at least the early 1990s.Click Apply and OK in the Properties window.Select a secondary audio playback device from the menu.Click on the down arrow to open the drop-down menu of Playback through this device.Right click on it once again and select Properties (or double click on it directly to open the Properties window).Right click on it again when it's enabled and select Set as Default Device.Please right click on Stereo Mix and select Enable from the context menu.Now, you’ll be able to see a recording device named Stereo Mix (or Wave Out Mix, Mono Mix, etc.).Select Show Disabled Devices from the pop-up menu.Now, go to the Recording tab next to Playback.Choose a primary speakers audio playback device and then click on the Set Default button.Go to the Playback tab instead of the Sounds tab selected by default.Select Sounds from the pop-up menu to open the Sound window.Right click on the sound volume icon in the system tray located in the lower right corner.Besides, you can select audio output devices for specific apps on Windows. ![]() How to output audio to two or multiple devices in Windows 10? You should enable Stereo Mix and select multiple outputs devices for audio playback Windows 10: right click on the sound volume -> select Sounds -> choose a primary audio playback device -> enable Stereo Mix -> set as default -> select a secondary audio playback device -> apply changes.
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