View Compilation Error

0_0_21856229_18849.cpp: In function 'double circle_and_triangle(C, P, P)':
0_0_21856229_18849.cpp:78:20: error: 'struct P' has no member named 'c'
  if(sgn(cj(a-c.c,b.c))==0)return 0;
                    ^