Ada 95: The Craft of Object-Oriented Programming by John English

By John English

This publication is an advent to Ada ninety five. It makes use of an example-driven method which steadily develops small trivial courses into huge case-study sort courses. the most emphasis of this ebook is on upkeep difficulties, and utilizing object-oriented expertise to jot down maintainable, extensible courses. software layout is brought in the course of the ebook, with hypothetical upkeep eventualities used to shoe layout shortcomings. and revise them to accomodate upkeep wishes. useful matters comparable to debugging courses are tackled, and demanding Ada positive aspects now not present in different languages are handled essentially and early on within the textual content. those comprise exception dealing with, user-defined forms, approaches, features, applications and baby applications. Preface and entry to chapters three and 17 plus all examples and suggestions will be downloaded.

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After line 8 has been executed we go round the main loop a second time. Operator ends up holding the character '*' and Operand ends up holding the value 3. The case statement executes line 9, which multiplies Result (3) by Operand (also 3) to give a new value of 9 for Result. Around the loop again, and Operator ends up holding a full stop at line 4. The result (9) is then displayed by line 5 before exiting from the main loop at line 6. g. ’) the section of the case statement at line 10 gets executed, which displays an error message.

Text_IO you will also discover the following procedure specification: procedure Put_Line (Item : in String); Put_Line is the same as Put except that it starts a new line after displaying the string supplied as its parameter; in other words, Put_Line is the same as Put followed by New_Line. "); end Hello; Input and output of integers is a bit more elaborate than it is for strings. Integer_Text_IO looks like this: procedure Put (Item : in Integer; Width : in Field := Default_Width; Base : in Number_Base := Default_Base); What this means is that there are two extra parameters called Width and Base which can be used when displaying integers.

2 Modify the calculator program so that after evaluating an expression it asks the user if he or she wants to evaluate another expression. If the answer is ‘y’ or ‘Y’ (yes), evaluate another expression; if it’s ‘n’ or ‘N’ (no) exit from the program. ’ to distinguish cats and dogs from elephants and giraffes. If the user says it’s a household pet, ask if it purrs; if not, ask if it has a long neck. Finally, tell the user which animal you think was chosen. Try extending the program to include a few more animals.

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