foo.cc: In function 'int main()':
foo.cc:9:22: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
    9 |   if(i%400==0||i%4==0&&i%100!=0)
      |                ~~~~~~^~~~~~~~~~
foo.cc:20:8: error: 'ify1' was not declared in this scope; did you mean 'y1'?
   20 |   else(ify1%400==0||y1%4==0&&y1%100!=0)sum+=29;
      |        ^~~~
      |        y1

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