/in/foo.cc: In function 'int isLeap(int)':
/in/foo.cc:7:25: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  if (y%400==0 || y%4==0 && y%100!=0)
                  ~~~~~~~^~~~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:27:21: warning: unused variable 'temp' [-Wunused-variable]
  int y, m, d, days, temp;
                     ^~~~