diff --git a/lib/functions.py b/lib/functions.py
index 9d84754d7..a12b4db81 100644
--- a/lib/functions.py
+++ b/lib/functions.py
@@ -1,16 +1,18 @@
 #!/usr/bin/env python3
 
 def greet_programmer():
-    pass
+    print("Hello, programmer!")
 
 def greet(name):
-    pass
+    print(f"Hello, {name}!")
+
+greet("Guido")    
 
 def greet_with_default(name="programmer"):
-    pass
+    print(f"Hello, {name}!")
 
-def add(num1, num2):
-    pass
+greet_with_default() 
+  
 
-def halve(number):
-    pass
+def add(num1, num2):
+    return (num1 + num2)