Precondition

In computer programming, a precondition is a condition or predicate that must always be true just prior to the execution of some section of code or before an operation in a formal specification.

If a precondition is violated, the effect of the section of code becomes undefined and thus may or may not carry out its intended work. Security problems can arise due to incorrect preconditions.

Often, preconditions are simply included in the documentation of the affected section of code. Preconditions are sometimes tested using assertions within the code itself, and some languages have specific syntactic constructions for doing so.

For example: the factorial is only defined for integers greater than or equal to zero. So a program that calculates the factorial of an input number would have preconditions that the number be an integer and that it be greater than or equal to zero.

In object-oriented programming

Preconditions in object-oriented software development are an essential part of design by contract. Design by contract also includes notions of postcondition and class invariant.

This page contains text from Wikipedia, the Free Encyclopedia - https://wn.com/Precondition

Latest News for: Precondition

Spotlight: Erdogan sets election in Syria as precondition for Turkey's withdrawal

Xinhua 11 Oct 2018

ANKARA, Oct. 11 (Xinhua) -- Turkish President Recep Tayyip Erdogan has said his country will not leave Syria until a general election is held in the war-torn country, signaling that Turkish military would continue to stay in its neighbor country for an undetermined amount of time. "Whenever the Syrian people hold an election, we will leave Syria to its owners," Erdogan said during an interview with broadcaster TRT World ... 15 ... 10 ... ....

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Afghanistan- No Preconditions for Talks with Taliban: Khalilzad

MENA FN 30 Sep 2018

(MENAFN - Daily Outlook Afghanistan) KABUL - Washington is talking to the Taliban without any preconditions, America's special advisor on Afghanistan says, hinting at a shift in po... ....

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Debt Office sees no preconditions for issuing new lottery bonds

Nasdaq Globe Newswire 28 Sep 2018

As commissioned by the Government, the Swedish National Debt Office has considered whether to wind up borrowing in lottery bonds after a pause in issuance since 2016. The Debt Office's assessment is that lottery bonds can no longer contribute to the objective of reducing the cost of central government debt ... ....

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75% of Japanese Oppose Peace Treaty With Russia Without Preconditions - Reports

Sputnik 24 Sep 2018

TOKYO (Sputnik) - Around 75 percent of the Japanese oppose the possible signing of a permanent peace treaty with Russia without preconditions and the settlement of the Kuril Islands dispute, the Yomiuri newspaper reported on Monday, citing an opinion poll ... ....

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Premiums from Preconditioning and Seasonal Price Swings . . .

Waurika News Journal 21 Sep 2018

The time of year is upon us to begin planning how we will market our spring born calves ... Within a single year a 400# calf may yield a higher dollar per hundredweight premium for preconditioning than does a 600# calf ... This is valuable to demonstrate the premium for that management practice, but it does not illustrate the seasonal price gains that take place over the typical preconditioning period ... .......

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Preconditioning boosts returns on 2018 calf crop

Woodward News 16 Sep 2018

There are many preconditioning options available for producers; however, a program with a proven track record is the Oklahoma Beef Quality Network (OQBN).�. OQBN and other preconditioning programs have been designed to aid producers in making preconditioning decisions and capturing value of preconditioned calves at market ... When the decision is made to precondition cattle, producers should evaluate their feed options....

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RT Editor-in-Chief Reveals Salisbury’s 'Suspects' Preconditions for Interview

Sputnik 13 Sep 2018

MOSCOW (Sputnik) - Margarita Simonyan, the editor-in-chief of the RT broadcaster and Sputnik news agency, said on Thursday that Russian citizens Alexander Petrov and Ruslan Boshirov, suspected by London in the Salisbury poisoning incident, had set preconditions before giving her an interview ... ....

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Putin suggests Russia, Japan agree to peace deal ‘without any preconditions’ by year’s end

Japan Times 12 Sep 2018

Russian President Vladimir Putin on Wednesday suggested Moscow and Tokyo sign a peace deal “without any preconditions” by the end of the year to try ... ....

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Putin offers Japan’s Abe peace treaty by end of year without preconditions

Russia Today 12 Sep 2018

Russian President Vladimir Putin offered Japanese leader Shinzo Abe a peace treaty between the two countries without preconditions by the end of the year ... ....

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Putin Proposes Signing Peace Treaty With Japan This Year 'Without Preconditions'

Radio Free Europe 12 Sep 2018

... preconditions."....

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Islands dispute must be settled before peace deal – Japan on Putin’s ‘no preconditions’ offer

Russia Today 12 Sep 2018

Japan said that before any peace deal with Russia is signed, the south Kuril Islands dispute must first be settled. President Vladimir Putin earlier offered to sign the peace treaty “without any preconditions.” ... ....

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Putin suggests Russia, Japan agree peace deal 'without preconditions' by year end

This is Money 12 Sep 2018

Putin and Abe met at the Eastern Economic Forum in Vladivostok. Russian President Vladimir Putin on Wednesday suggested Russia and Japan sign a peace deal "without any preconditions" by the end of the year to try to solve a long-running territorial dispute ... 'let's change our approaches.' Let's! Let's conclude a peace agreement, not now but by year's end without any preconditions," Putin said, with the audience breaking into applause ... ....

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Celyad Successfully Doses First Colorectal Cancer Patient With CYAD-01 Following Preconditioning Chemotherapy

Nasdaq Globe Newswire 05 Sep 2018

CYAD), a clinical-stage biopharmaceutical company focused on the development of CAR-T cell therapies, today announced the successful injection of the first patient under the amended protocol of the THINK trial, which assesses treatment with CYAD-01 after a non-myeloablative preconditioning chemotherapy regimen of cyclophosphamide and fludarabine in refractory metastatic colorectal cancer (CRC) patients ... ....

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