foo.cc: In function 'int main()':
foo.cc:12:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  for(int m=1; m<month; m++)
  ^~~
foo.cc:14:3: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   sum=35;
   ^~~
foo.cc:9:6: warning: unused variable 'year' [-Wunused-variable]
  int year,month,day; 
      ^~~~