使用函数计算两点间的距离

#include<stdio.h>
#include<math.h>
double dist(double x1,double y1,double x2,double y2)
{
	double s;
	s=sqrt(pow((x2-x1),2)+pow((y2-y1),2));
	return s;
}
int main()
{
	double x1,y1,x2,y2,s;
	scanf("%lf%lf",&x1,&y1);
	scanf("%lf%lf",&x2,&y2);
	s=dist(x1,y1,x2,y2);
	printf("%.2lf",s);
	return 0;
}