foo.cc: In function 'int main()':
foo.cc:12:21: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  if(y%400==0||y%4==0&&y%100!=0)
               ~~~~~~^~~~~~~~~~
foo.cc:21:6: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
  if(m=1)
     ~^~
foo.cc:70:31: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  if(y%400==0||y%4==0&&y%100!=0&&m>2)
               ~~~~~~~~~~~~~~~~^~~~~

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