Compilare: user.cpp: In function ‘double real_radius(Point, Point, Point, int&)’: user.cpp:119:10: warning: unused variable ‘d’ [-Wunused-variable] double d = sqrt((xm - C.x) * (xm - C.x) + (ym - C.y) * (ym - C.y)); ^ user.cpp: In member function ‘void InputReader::get_char()’: user.cpp:17:50: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff, sizeof(char), BUFF_SIZE, fin); ^