下面程序的输出结果是【】。include ＜iostream.h＞include ＜math.h＞class point{double x; double y;

下面程序的输出结果是【 】。

include ＜iostream.h＞

include ＜math.h＞

class point

{

double x;

double y;

public:

point(double a, double b)

{

x=a;

y=b;

}

friend double distance(point a, point b) ;

};

double distance(point a, point b)

{

return sqrt ((a. x-b.x) * (a. x-b.x)+ (a. y-b. y) * (a. y-b. y) );

}

void main()

{

point p1(1,2);

point p2(5,2);

cout＜＜distance(p1,p2)＜＜end1;

}