计算2点之间的距离

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计算2点之间的距离：

#import "Point2D.h"#import <math.h>@interface Point2D (){    double _x;    double _y;}//set和get方法-(void)setX:(double)x;-(double)x;-(void)setY:(double)y;-(double)y;-(void)setX:(double)x andsetY:(double)y;//计算距离方法-(double)distanceWithOtherPoint:(Point2D *)point;+(double)distanceWithPoint1:(Point2D *)point1 andPoint2:(Point2D *)point2;@end@implementation Point2D//x-(void)setX:(double)x{    _x = x;}-(double)x{    return _x;}//y-(void)setY:(double)y{    _y = y;}-(double)y{    return _y;}-(void)setX:(double)x andsetY:(double)y{    [self setX:x];    [self setY:y];}-(double)distanceWithOtherPoint:(Point2D *)point{    //X^2    double xDelta = [self x]-[point x];    double xDeltaPF  = pow(xDelta, 2);        //Y^2    double yDelta = [self y]-[point y];    double yDeltaPF = pow(yDelta, 2);        return sqrt(xDeltaPF+yDeltaPF);//开根号}+(double)distanceWithPoint1:(Point2D *)point1 andPoint2:(Point2D *)point2{    return [point2 distanceWithOtherPoint:point1];}int main(int argc, const char * argv[]) {        Point2D * p1 = [Point2D new];    Point2D * p2 = [Point2D new];            [p1 setX:10 andsetY:90];    [p2 setX:80 andsetY:67];        double  distance = [Point2D distanceWithPoint1:p1 andPoint2:p2];    NSLog(@"distance=%f",distance);        return 0;}@end

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