/in/foo.cc: In function 'int main()':
/in/foo.cc:7:18: warning: unused variable 'x' [-Wunused-variable]
  int y[13],s=0,t,x,month;
                  ^
/in/foo.cc:24:5: warning: 'p' may be used uninitialized in this function [-Wmaybe-uninitialized]
    p+=t;
    ~^~~