introduce KLIPSE in section 1.1.7

Author: viebel

source/section/1.1.7.html.md

@@ -103,22 +103,11 @@ always guess that the square root of any number is 1
   (sqrt-iter 1.0 x))
 ```
 
-If we type these definitions to the interpreter, we can use
-sqrt just as we can use any function:
-
-```
-> (sqrt 9)
-3.00009155413138
-
-> (sqrt (+ 100 37))
-11.704699917758145
-
-> (sqrt (+ (sqrt 2) (sqrt 3)))
-1.7739279023207892
-
-> (square (sqrt 1000))
-1000.000369924366
-```
+Now, let's play with it:
+<iframe frameborder="0" width="100%" height="800px"
+    src= 
+"http://app.klipse.tech?eval_only=1&cljs_in=(defn%20square%20%5Bx%5D%0A%20%20(*%20x%20x))%0A%0A(defn%20average%20%5Bx%20y%5D%0A%20%20(%2F%20(%2B%20x%20y)%202))%0A%0A(defn%20good-enough%3F%20%5Bguess%20x%5D%0A%20%20(%3C%20(abs%20(-%20(square%20guess)%20x))%200.001))%0A%0A(defn%20improve%20%5Bguess%20x%5D%0A%20%20(average%20guess%20(%2F%20x%20guess)))%0A%0A(defn%20abs%20%5Bn%5D%0A%20%20(max%20n%20(-%20n)))%0A%0A(defn%20sqrt-iter%20%5Bguess%20x%5D%0A%20%20(if%20(good-enough%3F%20guess%20x)%0A%20%20%20%20guess%0A%20%20%20%20(sqrt-iter%20(improve%20guess%20x)%20x)))%0A%0A(defn%20sqrt%20%5Bx%5D%0A%20%20(sqrt-iter%201.0%20x))%0A%0A%5B(sqrt%20100)%0A%20(sqrt%209)%0A%20(sqrt%20(%2B%20100%2037))%0A%20(sqrt%20(%2B%20(sqrt%202)%20(sqrt%203)))%0A%20(square%20(sqrt%201000))%5D">
+</iframe>
 
 The sqrt `program` also illustrates that the simple procedural
 language we have introduced so far is sufficient for writing any