Exercises in Software

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Exercises
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12-0 Compile, execute, and test the programs in this chapter 12-1 Reimplement the Str class, but choose an implementation strategy that requires that the class manage the storage itself For example, you might store an array of char and a length Consider what implications this change in design has for copy control Also consider the cost of using Vec, (eg, in storage overhead) 12-2 Implement the c_str, data, and copy functions 12-3 Define the relational operators for Str In doing so, you will want to know that the <cstring> header defines a function called strcmp, which compares two character pointers The function returns a negative integer if the null-terminated character array denoted by the first pointer is less than the second, zero if the two strings are equal, or a positive value if the first string is greater than the second
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12-4 Define the equality and inequality operators for Str 12-5 Implement concatenation for Str so as not to rely on conversions from const char* 12-6 Give Str an operation that will let us implicitly use a Str object as a condition The test should fail if the Str is empty, and should succeed otherwise 12-7 The standard string class provides random-access iterators to manipulate the string's characters Add iterators and the iterator operations begin and end to your Str class 12-8 Add the getline function to the Str class 12-9 Use class ostream_iterator to reimplement the Str output operator Why didn't we ask you to reimplement the input operator using class istream_iterator 12-10 Having seen in 121/212 how Str defined a constructor that takes a pair of iterators, we can imagine that such a constructor would be useful in class Vec Add this constructor to Vec, and reimplement Str to use the Vec constructor instead of calling copy 12-11 If you add the operations listed in these exercises, then you can use this Str class in all the examples in this book Reimplement the operations on character pictures from 5 and the split functions from 56/87 and 611/103 12-12 Define the insert function that takes two iterators for the Vec and Str classes 12-13 Provide an assign function that could be used to assign the values in an array to a Vec 12-14 Write a program to initialize a Vec from a string 12-15 The read_hw function from 413/57 checked the stream from which it read to determine whether the function had hit end-of-file, or had encountered an invalid input Our Str input operator does no such check Why Will it leave the stream in an invalid state
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Using inheritance and dynamic binding
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The last several chapters have explored how we can build our own data types This ability is one of the foundations of object-oriented programming (OOP) This chapter will begin a look at the the other key components of OOP inheritance and dynamic binding In 9, we described a small class intended to encapsulate the operations used to solve the grading problem from 4 This chapter will revisit that problem This time, we'll assume that there's a change in specification: Students can take the course for undergraduate or graduate credit Obtaining graduate credit requires that the students do some extra work We'll assume that in addition to the homework and exams that all students must complete, graduate students also have to write a thesis As we'll see, this change in problem specification lends itself to an object-oriented solution, which we'll use to explore the language features that C++ offers to support OOP Our objective is to write new classes that will mirror these new requirements We'd also like our previous solution to the grading problem, from 96/166, to continue to work That is, we'd like classes that allow us to generate the final grade report by reading a file of grade records and writing a formatted report using the original code
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