/in/foo.cc: In function 'int main()':
/in/foo.cc:8:16: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
     else if(x=0)
                ^
/in/foo.cc:12:11: warning: 'y' may be used uninitialized in this function [-Wmaybe-uninitialized]
     cout<<y<<endl;
           ^