单项选择题

以下程序执行后的输出结果是
#include ＜iostream＞
using namespace std;
void try(int,int,int,int);
int main ()
int x,y,z,r;
x =1 ;
y = 2;
try(x,y,z,r);
cout＜＜r＜＜endl;
return 0;
void try(int x,int y,int z,int r)
z = x+y;
x = x*x;
y = y*y;
r = z+x+y;

A．18
B．9
C．10
D．不确定
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单项选择题
有以下程序： class Date public: Date(int y,int m,int 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 print() cout＜＜year＜＜ . ＜＜month＜＜ . ＜＜day＜＜endl; private: int year,month,day; ; Date fun(Date d) Date temp; temp = d; resurn temp; int main () Date date1 (2000,1,1),date2 (0,0,0); Date date3 (date1); date2 = fun(date3); return 0; 程序执行时，Date类的拷贝构造函数被调用的次数是
A．2
B．3
C．4
D．5
单项选择题
若有以下程序： #include ＜iostream＞ using namespace std; class Base public: Base () x=0; int x; ; class Derived1 : virtual public Base public: Derived1 () x=10; ; class Derived2 : virtual public Base public: Derived2 () x=20; ; class Derived : public Derived1,protected Derived2 ; int main() Derived obi; cout＜＜obj.x＜＜endl; return 0; 该程序运行后的输出结果是
A．20
B．30
C．10
D．0
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