By Phil Coulthard, George Farr

The booklet may still concentrate on Java on AS400. additionally it makes use of visible Age that's superseded may still use Websphere as a substitute. the code isn't really transparent because it attempts to match COBOL(structure programing) with Java(Object orientated

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Extra resources for Java(tm) for S/390® and AS/400® COBOL Programmers

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Average (x, y), which returns the average of x and y, given the precondition that x and y are both real numbers. 24. 2 to calculate the probability of winning a lottery in which the lottery managers: 1. Choose 2 numbers out of a pool of 6. 2. Choose 3 numbers out of a pool of 5. 3. ) [4]For instance, the "++" and "--" operators in Java and C++. 5 ENCAPSULATING VALUES Most of the preceding examples of value-producing methods calculate their results from parameters supplied with a message. Often, however, this is not a very convenient way to provide inputs to a method.

Encapsulation allows clients to use the operations without having to know how they are implemented. Clients only need to know which messages elicit which behaviors from instances of the class. Encapsulating an algorithm in a method hides many details of its design from clients, and many details of its use from implementors. However, two things remain shared by clients and implementors: the algorithm's preconditions and postconditions. Good preconditions and postconditions describe all, and only, the properties of the algorithm that abstraction should not hide.

4 ALGORITHMS THAT PRODUCE VALUES 7. log2 x 8. y! 22. Many programming languages' built-in trigonometric operators include one that computes the inverse tangent of its operand, but nothing to compute an inverse sine. Programmers who need inverse sines must thus write expressions to compute them. Devise an expression that computes sin-1 x, assuming you have a tan-1 operator. What preconditions must hold in order for this expression to have a value? Recall that sinα is not strictly invertible, that is, for any α such that sinα = x, an infinite number of other angles also have sines equal to x.

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