By John English
This e-book is an creation to Ada ninety five. It makes use of an example-driven process which steadily develops small trivial courses into huge case-study sort courses. the most emphasis of this publication is on upkeep difficulties, and utilizing object-oriented know-how to write down maintainable, extensible courses. software layout is brought during the booklet, with hypothetical upkeep eventualities used to shoe layout shortcomings. and revise them to accomodate upkeep wishes. sensible matters similar to debugging courses are tackled, and critical Ada good points no longer present in different languages are handled virtually and early on within the textual content. those contain exception dealing with, user-defined kinds, strategies, features, programs and baby applications. Preface and entry to chapters three and 17 viahttp:IIwww.comp.it.bton.ac.uk/je.adacraft plus all examples and options could be downloaded.
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Extra info for Ada 95: The Craft of Object-Oriented Programming
Text_IO; procedure Greetings is Answer : Character; begin loop -- 1 Put ("Is it morning (m) or afternoon (a)? "); end if; end loop; -- 4 end Greetings; -- 5 This program contains a loop statement which starts at line 1 and ends at line 4. Again, it’s a compound statement; it starts with loop on line 1 and ends with end loop and a semicolon on line 4. The sequence of statements it encloses will be repeated over and over again when it’s executed. It will only stop repeating when you execute one of the exit statements on lines 2 and 3.
Then we have to pass R as a parameter to Put. Two statements are needed, not to mention the extra intermediate variable R. An alternative solution would be to define Day_Of as a function. A function is just like a procedure except that it evaluates to a result that can be used as part of an expression; for example, a function call could be used as the value for an input parameter in a procedure call (or a call to another function), or as part of an expression on the right hand side of an assignment statement.
E. either line 5 or line 7 has been executed), execution continues with whatever follows the if statement. In this case it is line 9, which is the end of the program. Note that you have to use single quote marks to enclose characters; 'm' is the letter m as a value of type Character, whereas "m" is a string which is one character in length. The compiler takes this apparently trivial difference quite seriously, since the particular style of quote is used to distinguish values of type Character from values of type String, which in turn determines what operations can legitimately be performed on them.