/in/foo.c: In function 'main':
/in/foo.c:19:20: error: 'max_index\U0000ff01' undeclared (first use in this function); did you mean 'max_index'?
   19 |                 if(max_index！=i){
      |                    ^~~~~~~~~~~
      |                    max_index
/in/foo.c:19:20: note: each undeclared identifier is reported only once for each function it appears in
/in/foo.c:26:26: warning: format '%d' expects argument of type 'int', but argument 2 has type 'int *' [-Wformat=]
   26 |                 printf("%d",&arr[i]);
      |                         ~^  ~~~~~~~
      |                          |  |
      |                          |  int *
      |                          int
      |                         %ls