/in/foo.cc: In function 'bool f(int)':
/in/foo.cc:7:41: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  if (year % 400 == 0 || year % 100 != 0 && year % 4 == 0) return true;
                         ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:129:12: warning: unused variable 'j' [-Wunused-variable]
  int x, i, j;
            ^
/in/foo.cc:133:19: warning: unused variable 't' [-Wunused-variable]
  person* p[10], * t = new person;
                   ^