#include <stdio.h>
#include <math.h>
struct coordinate{
double x;
double y;
double z;
}A={1,5,2},B={5,3,1},C={2,8,4};
int main(void) {
double d
= 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)); double e
= sqrt((C.
x)*(C.
x)+(C.
y)*(C.
y)+(C.
z)*(C.
z)); return 0;
}
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