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5 Suppose you want to change the implementation of the class DigitalTime given in Displays 111 and 112 Specifically, you want to change the way the time is recorded Instead of using the two private variables hour and minute, you want to use a single (private) int variable, which will be called minutes In this new implementation the private variable minutes will record the time as the number of minutes since the time 0:00 (that is, since midnight) For example, 1:30 is recorded as 90 minutes, since it is 90 minutes past midnight Describe how you need to change the interface and implementation files shown in Displays 111 and 112 You need not write out the files in their entirety; just indicate what items you need to change and how, in a very general way, you would change them
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What s in a name That which we call a rose By any other name would smell as sweet
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When a program uses different classes and functions written by different programmers there is a possibility that two programmers will use the same name for two different things Namespaces are a way to deal with this problem A namespace is a collection of name de nitions, such as class de nitions and variable declarations A namespace can, in a sense, be turned on and off so that when some of its names would otherwise con ict with names in another namespace, it can be turned off
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s NAMESPACES AND using DIRECTIVES
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We have already been using the namespace that is named std The std namespace contains all the names de ned in many of the standard C++ library les (such as iostream) For example, when you place the following line at the start of a le,
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#include <iostream>
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it places all the name de nitions (for names like cin and cout) into the std namespace Your program does not know about names in the std namespace unless you specify that it is using the std namespace To make all the de nitions in the std namespace available to your code, insert the following using directive:
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using namespace std;
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A good way to see why you might want to include this using directive is to think about why you might want to not include it If you do not include this using directive for the namespace std, then you can de ne cin and cout to have some meaning other than their standard meaning (Perhaps you want to rede ne cin and cout because you
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want them to behave a bit differently from the standard versions) Their standard meaning is in the std namespace; without the using directive (or something like it), your code knows nothing about the std namespace, and so, as far as your code is concerned, the only de nitions of cin and cout it knows are whatever de nitions you give them Every bit of code you write is in some namespace If you do not place the code in some speci c namespace, then the code is in a namespace known as the global namespace So far we have not placed any code we wrote in any namespace and so all our code has been in the global namespace The global namespace does not have a using directive because you are always using the global namespace You could say there is always an implicit automatic using directive that says you are using the global namespace Note that you can use more than one namespace in the same program For example, we are always using the global namespace and we are usually using the std namespace What happens if a name is de ned in two namespaces and you are using both namespaces This results in an error (either a compiler error or a run-time error, depending on the exact details) You can have the same name de ned in two different namespaces, but if that is true, then you can only use one of those namespaces at a time However, this does not mean you cannot use the two namespaces in the same program You can use them each at different times in the same program For example, suppose NS1 and NS2 are two namespaces and suppose myFunction is a void function with no arguments that is de ned in both namespaces but de ned in different ways in the two namespaces The following is then legal:
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{ using namespace NS1; myFunction( ); } { using namespace NS2; myFunction( ); }
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