foo.cc: In function 'bool ily(int)':
foo.cc:4:15: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
    4 |  return n%4==0&&n%100||n%400==0;
      |         ~~~~~~^~~~~~~
foo.cc: In function 'int md(int, int, int)':
foo.cc:14:15: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   14 |   else if(i<=7&&i%2||i>=8&&!i%2)sum+=31;
      |           ~~~~^~~~~
foo.cc: In function 'int main()':
foo.cc:27:9: warning: 'n' is used uninitialized in this function [-Wuninitialized]
   27 |  sum+=md(n,m,d2);
      |       ~~^~~~~~~~
foo.cc:27:9: warning: 'm' is used uninitialized in this function [-Wuninitialized]

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