What is the output produced by the following program in Software

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12 What is the output produced by the following program
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#include <iostream> using namespace std; namespace Outer { void message( ); namespace Inner { void message( ); } } int main( ) { Outer::message( ); Outer::Inner::message( ); using namespace Outer; Inner::message( ); return 0; }
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Answers to Self-Test Exercises
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namespace Outer { void message( ) { cout << "Outer\n"; } namespace Inner { void message( ) { cout << "Inner\n"; } } }
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Summary
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You can de ne a class and place the de nition of the class and the implementation of its member functions in separate les You can then compile the class separately from any program that uses it, and you can use this same class in any number of different programs A namespace is a collection of name de nitions, such as class de nitions and variable declarations There are three ways to use a name from a namespace: by making all the names in the namespace available with a using directive, by making the single name available with a using declaration for the one name, or by qualifying the name with the name of the namespace and the scope resolution operator You place a de nition in a namespace by placing the de nition in a namespace grouping for that namespace The unnamed namespace can be used to make a name de nition local to a compilation unit
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ANSWERS
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SELF-TEST EXERCISES
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1 Parts a, b, and c go in the interface file; parts d through h go in the implementation file (All the definitions of class operations of any sort go in the implementation file) Part i (that is, the main part of your program) goes in the application file 2 The name of the interface file ends in h 3 Only the implementation file needs to be compiled The interface file does not need to be compiled
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4 Only the implementation file needs to be recompiled You do, however, need to relink the files 5 You need to delete the private member variables hour and minute from the interface file shown in Display 111 and replace them with the member variable minutes (with an s) You do not need to make any other changes in the interface file In the implementation file, you need to change the definitions of all the constructors and other member functions, as well as the definitions of the overloaded operators, so that they work for this new way of recording time (In this case, you do not need to change any of the helping functions readHour, readMinute, or digitToInt, but that might not be true for some other class or even some other reimplementation of this class) For example, the definition of the overloaded operator, >>, could be changed to the following:
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istream& operator >>(istream& ins, DigitalTime& theObject) { int inputHour, inputMinute; DigitalTime::readHour(inputHour); DigitalTime::readMinute(inputMinute); theObjectminutes = inputMinute + 60*inputHour; return ins; }
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You need not change any application les for programs that use the class However, since the interface le is changed (as well as the implementation le), you will need to recompile any application les, and of course you will need to recompile the implementation le 6 No If you replace bigGreeting with greeting, you will have a definition for the name greeting in the global namespace There are parts of the program where all the name definitions in the namespace Space1 and all the name definitions in the global namespace are simultaneously available In those parts of the program, there would be two distinct definitions for
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void greeting( );
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7 Yes The additional definition would cause no problems because overloading is always allowed When, for example, the namespace Space1 and the global namespace are available, the function name greeting would be overloaded The problem in Self-Test Exercise 6 was that there would sometimes be two definitions of the function name greeting with the same parameter lists 8 Hello
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