有如下程序:#include <iostream>using namespace std;class point{int x, y;public:point(int v
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(); return ();}执行后的输出结果是()。
A.10, 10
B.20, 20
C.10, 20
D.30, 30