foo.cc: In function 'int sumday(int, int, int)':
foo.cc:35:36: error: 'isleapyear' was not declared in this scope; did you mean 'leapyear'?
   35 |                                 if(isleapyear(year1))
      |                                    ^~~~~~~~~~
      |                                    leapyear
foo.cc: In function 'int main()':
foo.cc:60:20: error: 'isleapyear' was not declared in this scope; did you mean 'leapyear'?
   60 |                 if(isleapyear(i))
      |                    ^~~~~~~~~~
      |                    leapyear

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