Answer Posted / pratik

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.

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