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;
}