foo.cc: In function 'int isLeapYear(int)':
foo.cc:30:18: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   30 |  return year%4==0&&year%100!=0||year%400==0;
      |         ~~~~~~~~~^~~~~~~~~~~~~
foo.cc: At global scope:
foo.cc:46:4: warning: unnecessary parentheses in declaration of 'passDays' [-Wparentheses]
   46 | int(passDays(int year,int month,int day))
      |    ^

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