foo.cc: In constructor 'Array1::Array1()':
foo.cc:7:6: warning: 'Array1::size' will be initialized after [-Wreorder]
    7 |  int size;  // 大小
      |      ^~~~
foo.cc:6:7: warning:   'int* Array1::data' [-Wreorder]
    6 |  int* data;
      |       ^~~~
foo.cc:10:2: warning:   when initialized here [-Wreorder]
   10 |  Array1() :size(0), data(NULL) { }
      |  ^~~~~~
foo.cc: In member function 'int Array2::AnDiannumber()':
foo.cc:111:10: warning: unused variable 'j' [-Wunused-variable]
  111 |   int i, j,k;
      |          ^

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