Literate programming - download pdf or read online

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While the result is still the same, the new organization resulting from this change allows for other changes in the future. For example, you may have to use a more complicated technique for calculating monthly interest, depending on the financial score of the borrower. This is now possible since the calculation of interest has been separated from the calculation of the monthly payment. Another aspect of this example should be noticed: if a method is used only inside the implementation, then it is not necessary to add it to the interface.

For example, you can decide to change the way getMonthlyPayment is implemented. Suppose, for example, that you want to have the interest calculated in a separate method, instead of using an inline expression as you are doing right now. h" @implementation Loan - (double) interestPerMonth { return interest/12; } // updated calculation of month payments // using the new interestPerMonth method. - (double) getMonthlyPayment { double monthlyInterest = [self interestPerMonth]; return principal * monthlyInterest; } @end Notice how the new calculation uses another method called interestPerMonth.

The inherited class is referred to as the super class, parent class, or base class. The inheritance relationship is CHAPTER 2: Classes 31 recursive, therefore forming a class hierarchy. In Objective-C, only single inheritance is possible; that is, classes can inherit data and code from a single class only (but this can be made more flexible by the use of the protocol mechanism, as you will see in a future chapter). 3. Polymorphism: This is a central concept in OOP, since it allows the same message to be responded to in different ways depending on the object that receives the message.

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