foo.cc: In function 'int main()':
foo.cc:8:5: error: 'mouth' was not declared in this scope
  if(mouth==1)
     ^~~~~
foo.cc:8:5: note: suggested alternative: 'month'
  if(mouth==1)
     ^~~~~
     month
foo.cc:58:41: error: expected primary-expression before '=' token
   if(year%400==0||(year%4==0&&year%100!==0))
                                         ^
foo.cc:60:13: warning: statement has no effect [-Wunused-value]
    days+days+1;
    ~~~~~~~~~^~

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