Update exercises_user_defined_functions.md

planning/exercises_user_defined_functions.md

@@ -5,3 +5,30 @@
    Try to reuse the first maximum of two numbers function.
 3. Write a Python function that accepts a list as a parameter. Next, it
    determines and prints the number of positive and negative numbers.
+
+def max_of_two(x,y):
+    """Returns the maximum of two variables x and y."""
+    if x>y:
+        return x
+    else:
+        return y
+
+def max_of_three(x,y,z):
+    """Returns the maximum of two variables x and y."""
+    if x>y and x>z:
+        return x
+    elif z>x and z>y:
+        return z
+    else:
+        return y
+
+def pos_or_neg(aList):
+    """Returns the positive and negative values of a list."""
+    positive=[]
+    negative=[]
+    for i in aList:
+        if i>=0:
+            positive.append(i)
+        else:
+            negative.append(i)
+    return print("The positive values in the list are: ",positive,". The negative values in the list are: ",negative,".")