foo.cc:7:12: error: extended character 、 is not valid in an identifier
    7 |         if(x、100!=0&&x%4==0||x%4==0)
      |            ^
foo.cc: In function ‘int main()’:
foo.cc:7:12: error: ‘x、100’ was not declared in this scope
    7 |         if(x、100!=0&&x%4==0||x%4==0)
      |            ^~~~~~