7.2　マウスをドラッグする

[Iwao@fedora C713]$ cd ../C72
[Iwao@fedora C72]$ g++ c72.cpp -lglut -lGL
c72.cpp: 関数 ‘void motion(int, int)’ 内:
c72.cpp:78:14: エラー: expected ‘;’ before ‘}’ token
   78 |   ::glFlush()
      |              ^
      |              ;
   79 |   }
      |   ~           
[Iwao@fedora C72]$ g++ c72.cpp -lglut -lGL
[Iwao@fedora C72]$ ./a.out
[Iwao@fedora C72]$ g++ c72.cpp -lglut -lGL
[Iwao@fedora C72]$ ./a.out
[Iwao@fedora C72]$ ./a.out