In file included from main.cpp:17:0:
figure.h: In member function 'virtual double Circle::Perimeter()':
figure.h:76:9: error: expected ',' or ';' before 'return'
         return x
         ^~~~~~
figure.h:75:16: error: unused variable 'x' [-Werror=unused-variable]
         double x = 2 * 3.14 * r
                ^
figure.h:77:5: error: no return statement in function returning non-void [-Werror=return-type]
     }
     ^
cc1plus: all warnings being treated as errors