#include <stdio.h>

int main(void) {
	
	typedef struct {
		int x;
		int y;
	} point;

	point a = {3, 2};
	point b = {5, 7};

	double distance(point a, point b)
	{
    		return sqrt((a.x-b.x)*(a.x-b.x) + (a.y-b.y)*(a.y-b.y));
	} 
	
	printf("distance = %f", distance(a, b));
	return 0;
}