/in/foo.cc: In function 'int read()':
/in/foo.cc:14:2: warning: this 'while' clause does not guard... [-Wmisleading-indentation]
  while(!isdigit(c=getchar())) if(c=='-') k=-k; x=c^48;
  ^~~~~
/in/foo.cc:14:48: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'while'
  while(!isdigit(c=getchar())) if(c=='-') k=-k; x=c^48;
                                                ^
/in/foo.cc: In function 'int check(int)':
/in/foo.cc:40:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^