/in/foo.cc: In function 'int main()':
/in/foo.cc:59:40: warning: unused variable 'k' [-Wunused-variable]
             static int x1, y1, x2, y2, k;
                                        ^
/in/foo.cc: At global scope:
/in/foo.cc:59:40: warning: 'k' defined but not used [-Wunused-variable]