Read e-book online ADA in Practice PDF

By C. Ausnit, et al

ISBN-10: 3540961828

ISBN-13: 9783540961826

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There is no value after the because goodbye never returns. Obviously, to make practical use out of a recursive procedure, we must have some way to terminate the recursion. Most recursive procedures should have at least two basic elements, a base case and a recursion step. The base case terminates the recursion, giving the value of the procedure for some base argument. The recursion step gives the value in terms of the value of the procedure applied to a different argument. In order for the recursion to terminate, the different argument must be closer to the base argument in some way.

In Chez Scheme, for example, one way to trace a procedure is to type (trace name), where name is the name of a procedure you have defined at top level. If you trace length as defined above and pass it the argument '(a b c d), you should see something like this: |(length (a b c d)) | (length (b c d)) | |(length (c d)) | | (length (d)) | | |(length ()) | | |0 | | 1 | |2 | 3 |4 The indentation shows the nesting level of the recursion; the vertical lines associate applications visually with their values.

Most recursive procedures should have at least two basic elements, a base case and a recursion step. The base case terminates the recursion, giving the value of the procedure for some base argument. The recursion step gives the value in terms of the value of the procedure applied to a different argument. In order for the recursion to terminate, the different argument must be closer to the base argument in some way. Let's consider the problem of finding the length of a proper list recursively. We need a base case and a recursion step.

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ADA in Practice by C. Ausnit, et al


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