求两点的距离不知道咋整

#include<stdio.h>
#include<math.h>
int main()
{
double Xa,Ya,Xb,Yb,l;
scanf("%lf,%lf,%lf,%lf",&Xa,&Ya,&Xb,&Yb);
l=sprt(pow(Xa-Xb)+pow(Ya-Yb));
printf("%d",l);
return 0;

}

#include<stdio.h>
#include<math.h>
int main()
{
    double Xa,Ya,Xb,Yb,l;
    scanf("%lf,%lf,%lf,%lf",&Xa,&Ya,&Xb,&Yb);
    l=sqrt(pow(Xa-Xb,2)+pow(Ya-Yb,2));
    printf("%lf",l);
    return 0;

}

输出用%lf