用C求两点间的距离，提示实参过多 - C/C++ / C语言

#include<stdio.h>
#include<math.h>
int main(void)
{
double dist(double m);
double x1,x2,y1,y2;
double distance=0.0;
printf("Input (x1,y1):");
scanf("%lf%lf",&x1,&x2);
printf("Input (x2,y2):");
scanf("%lf%lf",&x2,&y2);
distance=dist(x1,x2,y1,y2);
printf("distance=%.2f",distance);

return 0;


}

double dist(double x1,double x2,double y1,double y2)
{
double i=0.0;
i=pow(x1-x2,2)+(y1-y2,2);
distance=sqrt(i);
return distance;
}



提示实参过多，怎么改呢？

PS: dist 必须有 x1,y1,x2,y2这四个参数。

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double dist(double m);
改成
double dist(double x1,double x2,double y1,double y2);

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这个属于低级错误........

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参数多的时候，就定义结构体吧。。。。。

#include<stdio.h>
#include<stdlib.h>

#include<math.h>

struct Point
{
  double x;
  double y;
};

double dist(Point p1,Point p2)
{
double i=pow(p1.x-p2.x,2)+pow(p1.y-p2.y,2);
double distance=sqrt(i);
return distance;
}
int _tmain(int argc, _TCHAR* argv[])
{
Point p1,p2;
double distance=0.0;
printf("Input (x1,y1):");
scanf("%lf %lf",&p1.x,&p1.y);
printf("Input