hdu-2105-The Center of Gravity

#include<stdio.h>
int main()
{
int n;
while(scanf("%d",&n)&&n)
{
double x1,x2,x3,y1,y2,y3;
while(n--)
{
scanf("%lf%lf%lf%lf%lf%lf",&x1,&y1,&x2,&y2,&x3,&y3);
printf("%.1lf %.1lf\n",(x1+x2+x3)/3,(y1+y2+y3)/3);
}
}
return 0;
}