/in/foo.cc: In function 'int main()':
/in/foo.cc:5:27: warning: unused variable 'cx' [-Wunused-variable]
    5 |         float ax,ay,bx,by,cx,cy;
      |                           ^~
/in/foo.cc:5:30: warning: unused variable 'cy' [-Wunused-variable]
    5 |         float ax,ay,bx,by,cx,cy;
      |                              ^~
/in/foo.cc:8:15: warning: unused variable 'kac' [-Wunused-variable]
    8 |         float kac=(kab+3.0777)/(1-kab*3.0777);
      |               ^~~