/in/ex2.cpp:146:13: error: expected '(' for function-style cast or type construction
    ex2(int argc, char *argv[]);
        ~~~ ^
/in/ex2.cpp:146:24: error: expected '(' for function-style cast or type construction
    ex2(int argc, char *argv[]);
                  ~~~~ ^
/in/ex2.cpp:146:30: error: expected expression
    ex2(int argc, char *argv[]);
                             ^
/in/ex2.cpp:144:14: error: unused parameter 'argc' [-Werror,-Wunused-parameter]
int main(int argc, char *argv[])
             ^
4 errors generated.