foo.cc: In function ‘int main()’:
foo.cc:9:26: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses]
    9 |                 if(a%4==0&&a%100!=0||a%400==0)
      |                    ~~~~~~^~~~~~~~~~
foo.cc:17:26: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses]
   17 |                 if(a%4==0&&a%100!=0||a%400==0)
      |                    ~~~~~~^~~~~~~~~~
foo.cc:24:26: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses]
   24 |                 if(a%4==0&&a%100!=0||a%400==0)
      |                    ~~~~~~^~~~~~~~~~
foo.cc:31:26: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses]
   31 |                 if(a%4==0&&a%100!=0||a%400==0)
      |                    ~~~~~~^~~~~~~~~~
foo.cc:37:26: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses]
   37 |                 if(a%4==0&&a%100!=0||a%400==0)
      |                    ~~~~~~^~~~~~~~~~
foo.cc:43:26: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses]
   43 |                 if(a%4==0&&a%100!=0||a%400==0)
      |                    ~~~~~~^~~~~~~~~~
foo.cc:49:26: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses]
   49 |                 if(a%4==0&&a%100!=0||a%400==0)
      |                    ~~~~~~^~~~~~~~~~
foo.cc:55:26: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses]
   55 |                 if(a%4==0&&a%100!=0||a%400==0)
      |                    ~~~~~~^~~~~~~~~~
foo.cc:61:26: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses]
   61 |                 if(a%4==0&&a%100!=0||a%400==0)
      |                    ~~~~~~^~~~~~~~~~
foo.cc:67:26: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses]
   67 |                 if(a%4==0&&a%100!=0||a%400==0)
      |                    ~~~~~~^~~~~~~~~~
foo.cc:73:26: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses]
   73 |                 if(a%4==0&&a%100!=0||a%400==0)
      |                    ~~~~~~^~~~~~~~~~