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H lets implementation to go in timetypecpp

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Unformatted text preview: k at the TimeType.h Let's implementation, to go in TimeType.cpp. TimeType.cpp void TimeType::Set(int hrs, int mins, void TimeType::Set(int hrs, int int secs) { hours = hrs; minutes = mins; seconds = secs; } We just refer to the private data by name. Applied Programming Applied Programming Here's an example. TimeType time1, time2; if (time1.Equals(time2)) cout << "time1 equals time2\n"; This is like a binary operator (==) getting its left This operand from before the . and the second and operand from the argument. operand This is actually how operators are done, as we This shall soon see. shall Applied Programming This is just some newfangled way of data hiding. This Can't we do better? Can't Sure. We can ensure that the value of a Sure. TimeType is always valid. TimeType W hat if the hours to be set exceeds 23, or the What seconds is negative? seconds There are varying levels of protection, each There requiring differing levels of intervention. requiring Applied Programming Here's how. Precede the store with Level 1 if (secs > 59) // assume non-negative { mins += secs/60; secs %= 60; } if (mins > 59) // also here { hrs += mins/60; mins %= 60; } hrs %= 24; // and again Whatever i...
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