實現一個函式，對給定平面任意兩點座標(x ​1 ​​ ,y ​1 ​​ )和(x ​2 ​​ ,y ​2 ​​ )，求這兩點之間的距離

#include <stdio.h>
#include <math.h>

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

int main()
{    
    double x1, y1, x2, y2;

    scanf("%lf %lf %lf %lf", &x1, &y1, &x2, &y2);
    printf("dist = %.2f\n", dist(x1, y1, x2, y2));

    return 0;
}
double dist( double x1, double y1, double x2, double y2 )
{
    double d = pow( (x1-x2), 2) + pow( (y1-y2), 2);
    double f = sqrt( d );
    return f;
}