有以下程序:
#include<iostrearn>
using namespace std;
class sample
private:
int x;
static int y;
public:
sample (int
A.;
static void print (sample s);
;
sample::sample(intA)
x=a;
y+=x;
void sample::print(sample s)
cout<<"x"<<s.x<<",y="<<y<<end1;
int sample::y=0;
int main()
sample s1(10);
sample s2(20);
sample::print(s2);
return 0;
程序运行后的输出结果是A) x=10,y=20
B.x=20,y=30
C.x=30,y=20
D.x=30,y=30