#include <stdio.h>
#include <math.h>
struct Coordinate{
	double x;
		double y;
			double z;
};
int main(void) {
struct	Coordinate a=	{1,5,2};
	struct	Coordinate b=	{5,3,1};
	struct Coordinate c=	{2,8,4};
 
	double ab;
	double oc;
	ab=sqrt((a.x-b.x)*(a.x-b.x)+(a.y-b.y)*(a.y-b.y)+(a.z-b.z)*(a.z-b.z));
	oc=sqrt(c.x*c.x+c.y*c.y+c.z*c.z);
	if (ab>oc){
		printf("長い距離はab=%lf\n",ab);
	}else{
			printf("長い距離はoc=%lf\n",oc);
	}
	return 0;
}
 

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