有以下程序: classDate {public: Date(inty,intm,intd); {year=Y; month=m; day=d;} Date(inty=2000) {year=y; month=10; day=1;} Date(Date&d) {year=d.year; month=d.month; day=d.day;} voidprint() {cout<<year<<"."<<month<"."<< day<<endl;} private: intyear,month,day;}; Datefun(Dated) {Datetemp; temp=d; returntemp;} intmain() {Datedatel(2000,1,1),date2(0,0,O); Datedate3(date1); date2=fun(date3); return0;} 程序执行时,Date类的复制构造函数被调用的次数是( )。
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