double distance(point a,point b){} 这种写法对吗?参数是俩个对象前加类名

计算圆面积C语言问题,代码如下：#include #include double distance(double x1,double y1,double x2,double y2){double dx = x2 - x1;double dy = y2 - y1;double dsquared = dx * dx + dy * dy;double result = sqrt(dsquared);return result;}double ar double distance(point a,point b){} 这种写法对吗?参数是俩个对象前加类名 double double double double double double double double Double double double double double double double double