/in/foo.cc: In function 'int main()':
/in/foo.cc:7:11: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  if(n%4==0&&n%100!=0||n%400==0)
     ~~~~~~^~~~~~~~~~
/in/foo.cc: At global scope:
/in/foo.cc:13:1: error: 'c' does not name a type
 c
 ^