auto save

demo3.py

@@ -8,12 +8,10 @@
 num + func（num-1）；当num等于1的时候，func（1）返回值为1
 '''
 
-
 def func(num):
     if num == 1:
         return 1
-    value = num + func(num-1)  
+    value = num * func(num - 1)   
     return value
 
-
-print(func(10))
+print(func(999))

demo4.py

+def f(n):
+    if n == 1:
+        return 1
+    value = n *f(n-1) 
+    return value
+print(f(6))   
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