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.
Microbial life already had the necessary conditions to exist on our planet 3.5 billion years ago ...Fluid inclusions show potential for prehistoric life ... Explore further ... DOI ... Preconditions for life already present 3.5 billion years ago (2021, March 31) retrieved 31 March 2021 from https.//phys.org/news/2021-03-preconditions-life-billion-years.html ... ....
"The road to a massive or well-organized return is a long one and the preconditions are, in my opinion, not entirely there today," Engstrand-Neacsu said ... "If the rehabilitation and reconstruction is conditioned by donors by the achievement of a political solution and peace agreement, the preconditions for return will not be there.
February 24, 2021 Preconditions for a general-purpose central bank digital currency ... This paper aims to identify some high-level environmental preconditions that support a general-purpose CBDC in the United States. These preconditions are necessary, though not sufficient, and can be broadly grouped into five areas.