Find the Point Hacker Rank solution in C

https://www.hackerrank.com/challenges/find-point/problem

if point P(px,py) is rotated around point Q(qx,qy) by 180 degrees then it reaches a point R(rx,ry)

hence qQ would be mid point between P and R

so (px+rx)/2 = qx  and (py+ry)/2 = qy

from the above equatiions, px,py,qx and qy are given we need to find rx,ry

hence rx = 2*qx-px and ry = 2*qy-py

#include <stdio.h>
int main()
{
    int t;
    scanf("%d",&t);
    while(t--)
    {
        int px,py,qx,qy,rx,ry;
        scanf("%d%d%d%d",&px,&py,&qx,&qy);
        rx=2*qx-px;
        ry=2*qy-py;
        printf("%d %d\n",rx,ry);
    }
    return 0;
}