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有以下程序: Class Date { public: Date(int y,int m,mt d); { year=y; month=m; day=d; } Date(int y=2000) { year=y; month=10; day=1; } Date(Date &D) { year=d.year; month=d.month; day=d.day; } Void prin

单选题
2022-01-09 16:00
A、2
B、3
C、4
D、5
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正确答案
B

试题解析
解析: 本题考核拷贝构造函数。上述程序中,拷贝构造函数一共被调用了3次:第一次是在执行语句Date date3(date1);时,用已经建立的对象date1对正在建立的对象date3进行初始化;第二次是在调用fun函数时,由于是传值调用,因此实参对象date3要对形参对象d进行初始化;第三次是在执行fun函数中的返回语句return temp时,系统初始化一个匿名对象时使用了拷贝构造函数。

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