/in/foo.cc: In function 'int main()':
/in/foo.cc:7:18: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
    7 |         if(i%4==0&&i%100!=0||i%400==0)
      |            ~~~~~~^~~~~~~~~~
/in/foo.cc:8:9: error: 'cou' was not declared in this scope; did you mean 'cos'?
    8 |         cou<<"Y";
      |         ^~~
      |         cos