/in/foo.cc: In function 'int Judge(int)':
/in/foo.cc:6:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  for (int i = 2; i < sqrt(n); i++)
  ^~~
/in/foo.cc:9:3: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
   return 1;
   ^~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:17:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for ( i = 0; i < strlen(str); i++){
               ~~^~~~~~~~~~~~~