对给定平面任意两点坐标(x1,y1)和(x2,y2)，求这两点之间的距离

#include <stdio.h>
#include <math.h>
double f(float x1,float y1,float x2,float y2)
{
double m;
m=sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2));
return m;
}
int main()
{
float x1,y1,x2,y2;
printf(“分别输入两个点的坐标,格式为(x1,y1,x2,y2)\n”);
scanf("%f,%f,%f,%f",&x1,&y1,&x2,&y2);
printf(“距离为%f\n”,f(x1,y1,x2,y2));//f(x1,y1,x2,y2)调用自定义函数
}