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

double dist(float x1, float y1, float x2, float y2) {
	return sqrt(pow(x2-x1, 2) + pow(y2-y1, 2));
}

int main(int argc, char * argv[]) {

	float x1, y1, x2, y2;

	printf("Veuillez indiquer vos deux points sous la forme x1,y1 x2,y2 : ");
	scanf("%f,%f %f,%f", &x1, &y1, &x2, &y2);

	printf("La distance entre %.2f,%.2f et %.2f,%.2f est de ~%.5f\n", x1, y1, x2, y2, dist(x1,y1,x2,y2));
	return EXIT_SUCCESS;
}