foo.cc: In function 'int main()':
foo.cc:9:26: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
    9 |                 if(i%4==0&&i%100!=0||i%400==0)
      |                    ~~~~~~^~~~~~~~~~
foo.cc:12:9: error: 'coutans' was not declared in this scope
   12 |         coutans;
      |         ^~~~~~~

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