/in/foo.cc: In member function 'void bign::print()':
/in/foo.cc:12:3: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   for(int i=len;i>=1;i--)printf("%lld",num[i]);printf("\n");
   ^~~
/in/foo.cc:12:48: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
   for(int i=len;i>=1;i--)printf("%lld",num[i]);printf("\n");
                                                ^~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:209:6: warning: unused variable 'sum' [-Wunused-variable]
  int sum=0;
      ^~~