"and" and tail recursion

Can I build iterative process using recursive call in and statement?

For example, purpose, we have function fo开发者_JAVA技巧o that doesn't do anything. What kind of process it will create (iterative or recursion)?

(define (foo? bar) 
  (if (< bar 0) true (and (> 10 1) (foo? (- bar 1)))))

Yes, and is OK - you can read this in the standard.

For Lamberts sake, lets expand the syntax.

(define (foo? bar) 
  (if (< bar 0) 
      #t ; tail position, but no call
      (if (> 10 1) 
          (foo? (- bar 1)) ; tail position
          #f))) ; tail position, but no call