/in/foo.cc: In function 'int main()':
/in/foo.cc:10:16: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
  for(int i=3;i=k;i++) 
                ^
/in/foo.cc:16:8: warning: 'c' may be used uninitialized in this function [-Wmaybe-uninitialized]
  cout<<c<<endl;
        ^