Mahesh Chand
Define precondition and post-condition to a member function.
By Mahesh Chand in OOP/OOD on Jul 13 2006
  • Mahesh Chand
    Jul, 2006 13

    Precondition:A precondition is a condition that must be true on entry to a member function. A class is used correctly if preconditions are never false. An operation is not responsible for doing anything sensible if its precondition fails to hold.
    For example, the interface invariants of stack class say nothing about pushing yet another element on a stack that is already full. We say that isful() is a precondition of the push operation.
    Post-condition:A post-condition is a condition that must be true on exit from a member function if the precondition was valid on entry to that function. A class is implemented correctly if post-conditions are never false.
    For example, after pushing an element on the stack, we know that isempty() must necessarily hold. This is a post-condition of the push operation.
    .

    • 1
  • Vithal Wadje
    Nov, 2014 3

    Precondition: A precondition is a condition that must be true on entry to a member function. Post-condition: A post-condition is a condition that must be true on exit from a member function.

    • 0

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