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27-458: [REDACTED] Look up NOP  or nop in Wiktionary, the free dictionary. NOP or N.O.P. may refer to: Science and technology [ edit ] NOP (code) , an assembly language instruction etc. that effectively does nothing at all 3-Nitrooxypropanol , an enzyme inhibitor Nociceptin receptor , a neurotransmitter receptor in

54-548: A \n (newline) character, essentially fast-forwarding the current reading location of standard input to the beginning of next line. In Fortran , the CONTINUE statement is used in some contexts such as the last statement in a DO loop, although it can be used anywhere, and does not have any functionality. The JavaScript language does not have a built-in NOP statement. Many implementations are possible: Alternatives, in situations where

81-640: A 2004 agreement among white supremacist and neo-Nazi groups National Organic Program , an American organic food certification program Network of practice , in social science North Point station (station code NOP), a train station on the Hong Kong MTR Island Line Sinop Airport (IATA code NOP), an airport in Sinop, in the Black Sea Region of Turkey See also [ edit ] Noop (disambiguation) Topics referred to by

108-498: A NOP command that a client can issue to request a response from the server without requesting any other actions. Such a command can be used to ensure the connection is still alive or that the server is responsive. A NOOP command is part of the following protocols ( this is a partial list ): Note that unlike the other protocols listed, the IMAP4 NOOP command has a specific purpose—it allows the server to send any pending notifications to

135-417: A NOP. It is primarily used to ensure correct syntax due to Python's indentation-sensitive syntax ; for example the syntax for definition of a class requires an indented block with the class logic, which has to be expressed as pass when it should be empty. The ' : ' [colon] command is a shell builtin that has similar effect to a "NOP" (a do-nothing operation). It is not technically an NOP, as it changes

162-462: A National Basketball Association team based in New Orleans, Louisiana, US Nike Oregon Project , an athletics team Other uses [ edit ] New Orleans Protocol , a 2004 agreement among white supremacist and neo-Nazi groups National Organic Program , an American organic food certification program Network of practice , in social science North Point station (station code NOP),

189-632: A former resistance movement in Yugoslavia National Opinion Polls , a pollster acquired by GfK National Revival of Poland ( Narodowe Odrodzenie Polski ), a nationalistic Polish political party Northern Ontario Party , a political party in Ontario, Canada Sports [ edit ] New Orleans Pelicans , a National Basketball Association team based in New Orleans, Louisiana, US Nike Oregon Project , an athletics team Other uses [ edit ] New Orleans Protocol ,

216-449: A function is required, are: The AngularJS framework provides angular.noop function that performs no operations. The jQuery library provides a function jQuery.noop() , which does nothing. The Lodash library provides a function _.noop() , which returns undefined and does nothing. As with C, the ; used by itself can be used as a null statement in Pascal . In fact, due to

243-472: A jump, as a target of an execute instruction , or as a place-holder to be replaced by active instructions later on in program development (or to replace removed instructions when reorganizing would be problematic or time-consuming). In some cases, a NOP can have minor side effects; for example, on the Motorola 68000 series of processors, the NOP opcode causes a synchronization of the pipeline . Listed below are

270-424: A syntactic use in a wider context, e.g., within the context of a loop: alternatively, or more tersely: (note that the last form may be confusing, and as such generates a warning with some compilers or compiler options, as semicolon usually indicates an end of function call instruction when placed after a parenthesis on the end of line). The above code continues calling the function getchar() until it returns

297-423: A train station on the Hong Kong MTR Island Line Sinop Airport (IATA code NOP), an airport in Sinop, in the Black Sea Region of Turkey See also [ edit ] Noop (disambiguation) Topics referred to by the same term [REDACTED] This disambiguation page lists articles associated with the title NOP . If an internal link led you here, you may wish to change the link to point directly to

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324-399: Is a NOP or null statement if it has no effect. Null statements may be required by the syntax of some languages in certain contexts. In Ada , the null statement serves as a NOP. As the syntax forbids that control statements or functions be empty, the null statement must be used to specify that no action is required. (Thus, if the programmer forgets to write a sequence of statements,

351-403: Is different from Wikidata All article disambiguation pages All disambiguation pages NOP (code) Some computer instruction sets include an instruction whose explicit purpose is to not change the state of any of the programmer-accessible registers , status flags , or memory . It often takes a well-defined number of clock cycles to execute. In other instruction sets, there

378-473: Is no explicit NOP instruction, but the assembly language mnemonic NOP represents an instruction which acts as a NOP; e.g., on the SPARC , sethi 0, %g0 . A NOP must not access memory, as that could cause a memory fault or page fault . A NOP is most commonly used for timing purposes, to force memory alignment , to prevent hazards , to occupy a branch delay slot , to render void an existing instruction such as

405-456: The NOP instruction for some CPU architectures: 0x0F 0x1F 0x00 0x0F 0x1F 0x40 0x00 0x0F 0x1F 0x44 0x00 0x00 0x66 0x0F 0x1F 0x44 0x00 0x00 0x0F 0x1F 0x80 0x00 0x00 0x00 0x00 0x0F 0x1F 0x84 0x00 0x00 0x00 0x00 0x00 0x66 0x0F 0x1F 0x84 0x00 0x00 0x00 0x00 0x00 In the case of both the NOP and NOPR instructions, the first 0 in the second byte is the "mask" value, the condition to test such as equal, not equal, high, low, etc. If

432-446: The base register is also 0, the branch is not taken regardless of the value of the displacement register or displacement address. From a hardware design point of view, unmapped areas of a bus are often designed to return zeroes; since the NOP slide behavior is often desirable, it gives a bias to coding it with the all-zeroes opcode. A function or a sequence of programming language statements

459-421: The body of a function, a block must be used, but this can be empty. In C, statements cannot be empty—simple statements must end with a ; (semicolon) while compound statements are enclosed in {} (braces), which does not itself need a following semicolon. Thus in contexts where a statement is grammatically required, some such null statement can be used. The null statement is useless by itself, but it can have

486-414: The client. While most telnet or FTP servers respond to a NOOP command with "OK" or "+OK", some programmers have added quirky responses to the client. For example, the ftpd daemon of MINIX responds to NOOP with the message: NOPs are often involved when cracking software that checks for serial numbers, specific hardware or software requirements, presence or absence of hardware dongles , etc. in

513-415: The form of a NOP slide . This process is accomplished by altering functions and subroutines to bypass security checks and instead simply return the expected value being checked for. Because most of the instructions in the security check routine will be unused, these would be replaced with NOPs, thus removing the software's security functionality without altering the positioning of everything which follows in

540-420: The free dictionary. NOP or N.O.P. may refer to: Science and technology [ edit ] NOP (code) , an assembly language instruction etc. that effectively does nothing at all 3-Nitrooxypropanol , an enzyme inhibitor Nociceptin receptor , a neurotransmitter receptor in the opioid receptor family Organisations [ edit ] Croatian Partisans ( Narodnooslobodilački pokret ),

567-424: The intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=NOP&oldid=1218141350 " Category : Disambiguation pages Hidden categories: Short description is different from Wikidata All article disambiguation pages All disambiguation pages NOP [REDACTED] Look up NOP  or nop in Wiktionary,

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594-516: The mask is 0, no branch occurs. In the case of the NOPR instruction, the second value in the second byte is the register to branch on. If register 0 is chosen, no branch occurs regardless of the mask value. Thus, if either of the two values in the second byte is 0, the branch will not happen. In the case of the NOP instruction, the second value in the second byte is the "base" register of a combined base register, displacement register and offset address. If

621-447: The opioid receptor family Organisations [ edit ] Croatian Partisans ( Narodnooslobodilački pokret ), a former resistance movement in Yugoslavia National Opinion Polls , a pollster acquired by GfK National Revival of Poland ( Narodowe Odrodzenie Polski ), a nationalistic Polish political party Northern Ontario Party , a political party in Ontario, Canada Sports [ edit ] New Orleans Pelicans ,

648-425: The program will fail to compile.) The simplest NOP statement in C is the null statement , which is just a semi-colon in a context requiring a statement. Most C compilers generate no code for null statements, which has historical and performance reasons. An empty block (compound statement) is also a NOP, and may be more legible, but will still have no code generated for it by the compiler. In some cases, such as

675-403: The same term [REDACTED] This disambiguation page lists articles associated with the title NOP . If an internal link led you here, you may wish to change the link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=NOP&oldid=1218141350 " Category : Disambiguation pages Hidden categories: Short description

702-416: The special parameter $ ? (exit status of last command) to 0. It may be considered a synonym for the shell builtin 'true', and its exit status is true (0). The TeX typographical system's macro language has the \relax command. It does nothing by itself, but may be used to prevent the immediately preceding command from parsing any subsequent tokens. Many computer protocols , such as telnet , include

729-463: The specification of the language, in a BEGIN / END block, the semicolon is optional before the END statement, thus a semicolon used there is superfluous. Also, a block consisting of BEGIN END; may be used as a placeholder to indicate no action, even if placed inside another BEGIN / END block. The Python programming language has a pass statement which has no effect when executed and thus serves as

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