In computer programming, a postcondition is a condition or predicate that must always be true just after the execution of some section of code or after an operation in a formal specification. Postconditions are sometimes tested using assertions within the code itself. Often, postconditions are simply included in the documentation of the affected section of code.
For example: The result of a factorial is always an integer and greater than or equal to 1. So a program that calculates the factorial of an input number would have postconditions that the result after the calculation be an integer and that it be greater than or equal to 1. Another example: a program that calculates the square root of an input number might have the postconditions that the result be a number and that its square be equal to the input.
In computer programming, a postcondition is a condition or predicate that must always be true just after the execution of some section of code or after...
and Q {\displaystyle Q} the postcondition: when the precondition is met, executing the command establishes the postcondition. Assertions are formulae in...
weakest-preconditions, or runs forward in the case of strongest-postconditions. For a statement S and a postcondition R, a weakest precondition is a predicate Q such...
the ordinary definition of abstract data types with preconditions, postconditions and invariants. These specifications are referred to as "contracts"...
of design by contract. Design by contract also includes notions of postcondition and class invariant. The precondition for any routine defines any constraints...
given by a precondition Ps and a postcondition Qs is stronger than one given by a precondition Pt and a postcondition Qt (formally: (Ps, Qs) ⇒ (Pt, Qt))...
describes the meaning of a program fragment as the function transforming a postcondition to the precondition needed to establish it. Assertion (computing) Winskel...
totally correct with respect to a precondition P {\displaystyle P} and postcondition Q {\displaystyle Q} if any execution started in a state satisfying P...
and which are mostly specified implicitly using a precondition and postcondition. The "Danish School" (Bjørner et al. 1982) has tended to stress a constructive...
specification language for Java programs, using Hoare style pre- and postconditions and invariants, that follows the design by contract paradigm. Specifications...
that it considers the interaction of subtyping with preconditions, postconditions and invariants. Liskov's notion of a behavioural subtype defines a notion...
input should test a precondition and the expected output should test a postcondition. For applications or systems without formal requirements, test cases...
behaviour), and if it terminates, then the final state will satisfy the postcondition Q {\displaystyle Q} . In essence, during its execution, C {\displaystyle...
language has native support for type invariants (as well as pre- and postconditions, subtype predicates, etc.). A type invariant may be given on a private...
types can express preconditions when used as function arguments or postconditions when used as return types: for instance, the type of a function which...
and Python. It supports formal specification through preconditions, postconditions, loop invariants, loop variants, termination specifications and read/write...
preconditions, ("Assertions") Formulas still to be proven, including postconditions, ("Goals"), Terms denoting a valid output value ("Program") A justification...
this to be defined, the array must contain at least one element. The postconditions of max() require that the returned value is: (1) not smaller than any...
preconditions (what must be established before the action is performed); postconditions (what is established after the action is performed). Mathematically...
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