/in/foo.cc: In function 'int main()':
/in/foo.cc:6:13: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
     if(b = 4)
             ^
/in/foo.cc:9:14: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
      if(b = 6)
              ^
/in/foo.cc:12:18: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
          if(b = 9)
                  ^
/in/foo.cc:15:17: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
        if(b = 11)
                 ^
/in/foo.cc:18:17: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
         if(b = 2)
                 ^