有如下程序: #include<iostream> using namespace std; class point int x,y; public: point(int vx,int vy) x=vx; y=vy; point() x=0; y=0; point operator+(point p1) point p; int px=x+p1.x; int py=y+p1.y; return point(px,py); point operator-(point p1) point p; int px=x-p1.x; int py=y-p1.y; return point(px,py); void print() cout<<x<< , <<y<<end1; ; int main() point p1(10,10),p2(20,20); p1=p1+p2; p1.print(); retrun 0; 执行后的输出结果是
A.10,10
B.20,20
C.10,20
D.30,30