/in/foo.cc: In function 'int main()':
/in/foo.cc:28:8: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
  if(n=1) {
        ^
/in/foo.cc:21:8: warning: 'k' may be used uninitialized in this function [-Wmaybe-uninitialized]
     k++;
        ^
/in/foo.cc:29:6: warning: 't' may be used uninitialized in this function [-Wmaybe-uninitialized]
   t=t*1.2;
     ~^~~~
/in/foo.cc:10:4: warning: 's' may be used uninitialized in this function [-Wmaybe-uninitialized]
   s+=300;
   ~^~~~~