/in/foo.cc: In function 'int main(int, char**)':
/in/foo.cc:7:9: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
  if (x=0)(y=0);
         ^
/in/foo.cc:5:10: warning: unused variable 'm' [-Wunused-variable]
  int x,y,m,n,l;
          ^
/in/foo.cc:5:12: warning: unused variable 'n' [-Wunused-variable]
  int x,y,m,n,l;
            ^
/in/foo.cc:5:14: warning: unused variable 'l' [-Wunused-variable]
  int x,y,m,n,l;
              ^