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Object-oriented Programming in C# Contracts and Assertions * Correctness Software Qualities Correctness Specifications * Specification with preconditions and postconditions Logical expressions Examples of preconditions and postconditions An Assertion Language * Responsibilities and Contracts Questions Related to Responsibility Division of Responsibilities The highly responsible program Responsibility division by pre and postconditions Contracts Everyday Contracts Contracts: Obligations and Benefits Obligations and Benefits in Sqrt * Class Invariants General aspects of contracts Everyday invariants An example of a class invariant * Inheritance is Subcontracting Inheritance and Contracts Subcontracting Class invariants in the triangle class hierarchy Assertions in Abstract classes * Design by Contract Design by Contract DBC and Programming Languages Code Contracts in C# 4.0 * Loop Invariants Loop Invariants

Class Invariants