code for chapter 3

03_recursion/python/01_countdown.py

@@ -0,0 +1,10 @@
+def countdown(i):
+  print i
+  # base case
+  if i <= 0:
+    return
+  # recursive case
+  else:
+    countdown(i-1)
+
+countdown(5)

03_recursion/python/02_greet.py

@@ -0,0 +1,13 @@
+def greet2(name):
+    print "how are you, " + name + "?"
+
+def bye():
+    print "ok bye!"
+
+def greet(name):
+    print "hello, " + name + "!"
+    greet2(name)
+    print "getting ready to say bye..."
+    bye()
+
+greet("adit")

03_recursion/python/03_factorial.py

@@ -0,0 +1,7 @@
+def fact(x):
+  if x == 1:
+    return 1
+  else:
+    return x * fact(x-1)
+
+print fact(5)