foo.cc: In function ‘int main()’:
foo.cc:17:10: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses]
   17 | if(y%4==0&&y%100!=0||y%400==0)
      |    ~~~~~~^~~~~~~~~~
foo.cc:24:10: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses]
   24 | if(y%4==0&&y%100!=0||y%400==0)
      |    ~~~~~~^~~~~~~~~~
foo.cc:31:10: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses]
   31 | if(y%4==0&&y%100!=0||y%400==0)
      |    ~~~~~~^~~~~~~~~~
foo.cc:38:10: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses]
   38 | if(y%4==0&&y%100!=0||y%400==0)
      |    ~~~~~~^~~~~~~~~~
foo.cc:45:10: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses]
   45 | if(y%4==0&&y%100!=0||y%400==0)
      |    ~~~~~~^~~~~~~~~~
foo.cc:52:10: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses]
   52 | if(y%4==0&&y%100!=0||y%400==0)
      |    ~~~~~~^~~~~~~~~~
foo.cc:60:10: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses]
   60 | if(y%4==0&&y%100!=0||y%400==0)
      |    ~~~~~~^~~~~~~~~~
foo.cc:68:10: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses]
   68 | if(y%4==0&&y%100!=0||y%400==0)
      |    ~~~~~~^~~~~~~~~~
foo.cc:75:10: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses]
   75 | if(y%4==0&&y%100!=0||y%400==0)
      |    ~~~~~~^~~~~~~~~~
foo.cc:83:10: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses]
   83 | if(y%4==0&&y%100!=0||y%400==0)
      |    ~~~~~~^~~~~~~~~~