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/*
* Read coordinates of 2 2D-points from stdin and print their distance to stdout
* This is free and unencumbered software released into the public domain.
*/
#include <math.h>
#include <stdio.h>
/*
* The overhead caused by re-evaluating x in this case is much
* to change this into a function call.
*/
#define SQR(x) ((x) * (x))
/* Conventionally C names are in lowercase */
struct point {
double x, y;
};
double distance(struct point u, struct point v)
{
return sqrt(SQR(u.x - v.x) + SQR(u.y - v.y));
}
int main()
{
struct point m, n;
scanf("%lf %lf %lf %lf", &m.x, &m.y, &n.x, &n.y);
printf("%g\n", distance(m, n));
return 0;
}
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