View Compilation Error

0_0_33159025_30451.cpp: In function 'int Geo_2D::get_tangents(Geo_2D::Circle, Geo_2D::Circle, Geo_2D::Point*, Geo_2D::Point*)':
0_0_33159025_30451.cpp:234:54: error: expected primary-expression before '%' token
  double d2=(A.c.x-B.c.x)*(A.c.x-B.c.x)+(A.c.y-B.c.y)*%2
                                                      ^
0_0_33159025_30451.cpp:234:55: error: expected ',' or ';' at end of input
  double d2=(A.c.x-B.c.x)*(A.c.x-B.c.x)+(A.c.y-B.c.y)*%2
                                                       ^
0_0_33159025_30451.cpp:234:55: error: expected '}' at end of input
0_0_33159025_30451.cpp: At global scope:
0_0_33159025_30451.cpp:234:55: error: expected '}' at end of input