Design By Contract

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Tutorial: Design By Contract

Bertrand Meyer formalized a programming methodology called Design by Contract.

Tutorial Details:

Bertrand Meyer formalized a programming methodology called Design by Contract, which has become popular in some groups. In addition to specifying programming code to carry out the operations of a function (method), the programmer also specifies:

Preconditions - assumptions the function makes. These are usually expressed as statements that must be true about the parameters. This is the part of the "contract" that the caller must agree to.
Postconditions - conditions that are true when it finishes. These conditions define the responsibilities of the function, and are the part of the contract that the function agrees to.

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