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

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