in204:tds:sujets:td2:part3
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| Both sides previous revision Previous revision Next revision | Previous revision | ||
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in204:tds:sujets:td2:part3 [2019/10/01 18:28] bmonsuez [Question n°1] |
in204:tds:sujets:td2:part3 [2022/11/18 10:49] (current) |
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| Line 20: | Line 20: | ||
| <hidden Correction> | <hidden Correction> | ||
| + | |||
| + | <code cpp> | ||
| class MyBiDiCounter: public MyCounter | class MyBiDiCounter: public MyCounter | ||
| { | { | ||
| public: | public: | ||
| + | MyBiDiCounter(): MyCounter() {} | ||
| + | explicit MyBiDiCounter(unsigned theMax): | ||
| + | MyCounter(theMax) | ||
| + | {} | ||
| + | MyBiDiCounter(unsigned theCounter, | ||
| + | unsigned theMax): MyCounter(theCounter, theMax) | ||
| + | {} | ||
| + | MyBiDiCounter(const MyBiDiCounter& anotherCounter): | ||
| + | MyCounter(anotherCounter.counter) | ||
| + | {} | ||
| + | |||
| + | void decrement() | ||
| + | { | ||
| + | if(counter == 0) | ||
| + | counter = max; | ||
| + | else | ||
| + | counter --; | ||
| + | } | ||
| void increment(unsigned value) | void increment(unsigned value) | ||
| Line 30: | Line 50: | ||
| else | else | ||
| counter = (counter + value) % max; | counter = (counter + value) % max; | ||
| + | } | ||
| + | void print() const | ||
| + | { | ||
| + | std::cout << "Compteur: " << counter << "/" << max << std::endl; | ||
| } | } | ||
| }; | }; | ||
| + | |||
| + | </code> | ||
| + | |||
| </hidden> | </hidden> | ||
| + | |||
| ==== Question n°2 ==== | ==== Question n°2 ==== | ||
| Line 42: | Line 70: | ||
| for(unsigned i = 0; i <= 5; i++) | for(unsigned i = 0; i <= 5; i++) | ||
| { | { | ||
| - | bidiCounter1.increment(5); | + | bidiCounter1.increment(5); |
| bidiCounter1.print(); | bidiCounter1.print(); | ||
| } | } | ||
| Line 64: | Line 92: | ||
| </code> | </code> | ||
| - | |||
| Expliquer pourquoi cela ne fonctionne pas ? Proposer une modification de l’appel pour que cela puisse fonctionner. | Expliquer pourquoi cela ne fonctionne pas ? Proposer une modification de l’appel pour que cela puisse fonctionner. | ||
| + | |||
| + | |||
| + | <hidden Correction> | ||
| + | |||
| + | La nouvelle méthode ''increment(unsigned)'' cache l'ensemble des méthodes ''increment'' définies dans la classe de base ''MyCounter''. Il faut dans ce cas ajouter à la classe : | ||
| + | |||
| + | <code cpp> | ||
| + | public: | ||
| + | using MyCounter::increment; | ||
| + | </code> | ||
| + | |||
| + | Ce qui nous donne la classe suivante : | ||
| + | |||
| + | <code cpp> | ||
| + | class MyBiDiCounter: public MyCounter | ||
| + | { | ||
| + | public: | ||
| + | MyBiDiCounter(): MyCounter() {} | ||
| + | explicit MyBiDiCounter(unsigned theMax): | ||
| + | MyCounter(theMax) | ||
| + | {} | ||
| + | MyBiDiCounter(unsigned theCounter, | ||
| + | unsigned theMax): MyCounter(theCounter, theMax) | ||
| + | {} | ||
| + | MyBiDiCounter(const MyBiDiCounter& anotherCounter): | ||
| + | MyCounter(anotherCounter.counter) | ||
| + | {} | ||
| + | |||
| + | void decrement() | ||
| + | { | ||
| + | if(counter == 0) | ||
| + | counter = max; | ||
| + | else | ||
| + | counter --; | ||
| + | } | ||
| + | using MyCounter::increment; | ||
| + | void increment(unsigned value) | ||
| + | { | ||
| + | if(counter + value < max) | ||
| + | counter += value; | ||
| + | else | ||
| + | counter = (counter + value) % max; | ||
| + | } | ||
| + | void print() const | ||
| + | { | ||
| + | std::cout << "Compteur: " << counter << "/" << max << std::endl; | ||
| + | } | ||
| + | }; | ||
| + | |||
| + | |||
| + | </code> | ||
| + | |||
| + | </hidden> | ||
in204/tds/sujets/td2/part3.1569954533.txt.gz · Last modified: 2019/10/01 18:28 by bmonsuez
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