cps tweak

Signed-off-by: Jim Pryor <profjim@jimpryor.net>

diff --git a/cps_and_continuation_operators.mdwn b/cps_and_continuation_operators.mdwn
index 2063ef0..0d4eb1d 100644 (file)
--- a/cps_and_continuation_operators.mdwn
+++ b/cps_and_continuation_operators.mdwn
@@ -330,13 +330,14 @@ Next, try to figure out what this function does:
                              [(null? l) (k 'notfound)]
                              [(eq? (car l) a) (cdr l)]
                              [(atom? (car l)) (cons (car l) (aux (cdr l) k))]
-                             ; what happens when (car l) exists but isn't an atom?
-                             [else (let ([car2 (let/cc k2 ; now what will happen when k2 is called?
-                                                 (aux (car l) k2))])
-                                     (cond
-                                       ; when will the following condition be met? what happens then?
-                                       [(eq? car2 'notfound) (cons (car l) (aux (cdr l) k))]
-                                       [else (cons car2 (cdr l))]))]))]
+                             [else
+                              ; what happens when (car l) exists but isn't an atom?
+                              (let ([car2 (let/cc k2 ; now what will happen when k2 is called?
+                                            (aux (car l) k2))])
+                                (cond
+                                  ; when will the following condition be met? what happens then?
+                                  [(eq? car2 'notfound) (cons (car l) (aux (cdr l) k))]
+                                  [else (cons car2 (cdr l))]))]))]
                     [lst2 (let/cc k1 ; now what will happen when k1 is called?
                             (aux lst k1))])
              (cond
@@ -344,7 +345,6 @@ Next, try to figure out what this function does:
                [(eq? lst2 'notfound) lst]
                [else lst2]))))
 
-
 Here is [the answer](/hints/cps_hint_3), but try to figure it out for yourself.
 
 Here is the hardest example. Try to figure out what this function does:

diff --git a/hints/cps_hint_3.mdwn b/hints/cps_hint_3.mdwn
index 845f556..afc5bee 100644 (file)
--- a/hints/cps_hint_3.mdwn
+++ b/hints/cps_hint_3.mdwn
@@ -12,16 +12,17 @@ This function is developed in *The Seasoned Schemer* pp. 84-89. It accepts an at
                              [(null? l) (k 'notfound)]
                              [(eq? (car l) a) (cdr l)]
                              [(atom? (car l)) (cons (car l) (aux (cdr l) k))]
-                             ; when (car l) exists but isn't an atom, we try to remove a from (car l)
-                             ; if we succeed we prepend the result to (cdr l) and stop
-                             [else (let ([car2 (let/cc k2
-                                                 ; calling k2 with val will bind car2 to val and continue with the (cond ...) block below
-                                                 (aux (car l) k2))])
-                                     (cond
-                                       ; if a wasn't found in (car l) then prepend (car l) to the result of removing a from (cdr l)
-                                       [(eq? car2 'notfound) (cons (car l) (aux (cdr l) k))]
-                                       ; else a was found in (car l)
-                                       [else (cons car2 (cdr l))]))]))]
+                             [else
+                              ; when (car l) exists but isn't an atom, we try to remove a from (car l)
+                              ; if we succeed we prepend the result to (cdr l) and stop
+                              (let ([car2 (let/cc k2
+                                            ; calling k2 with val will bind car2 to val and continue with the (cond ...) block below
+                                            (aux (car l) k2))])
+                                (cond
+                                  ; if a wasn't found in (car l) then prepend (car l) to the result of removing a from (cdr l)
+                                  [(eq? car2 'notfound) (cons (car l) (aux (cdr l) k))]
+                                  ; else a was found in (car l)
+                                  [else (cons car2 (cdr l))]))]))]
                     [lst2 (let/cc k1
                             ; calling k1 with val will bind lst2 to val and continue with the (cond ...) block below
                             (aux lst k1))])