MrDP18
diff --git a/‎ch08-conditional-logic/7-simulate-events-and-calculate-probabilities.py
Lines changed: 13 additions & 8 deletions b/‎ch08-conditional-logic/7-simulate-events-and-calculate-probabilities.py
Lines changed: 13 additions & 8 deletions
diff --git a/‎ch08-conditional-logic/8a-challenge.py
Lines changed: 55 additions & 0 deletions b/‎ch08-conditional-logic/8a-challenge.py
Lines changed: 55 additions & 0 deletions
diff --git a/‎ch08-conditional-logic/8b-challenge.py
Lines changed: 42 additions & 0 deletions b/‎ch08-conditional-logic/8b-challenge.py
Lines changed: 42 additions & 0 deletions
diff --git a/‎ch08-conditional-logic/9c-challenge.py renamed to ‎ch08-conditional-logic/8c-challenge.py b/‎ch08-conditional-logic/9c-challenge.py renamed to ‎ch08-conditional-logic/8c-challenge.py
diff --git a/‎ch08-conditional-logic/8-challenge.py renamed to ‎ch08-conditional-logic/9-challenge.py b/‎ch08-conditional-logic/8-challenge.py renamed to ‎ch08-conditional-logic/9-challenge.py
diff --git a/‎ch08-conditional-logic/9a-challenge.py
Lines changed: 0 additions & 31 deletions b/‎ch08-conditional-logic/9a-challenge.py
Lines changed: 0 additions & 31 deletions
diff --git a/‎ch08-conditional-logic/9b-challenge.py
Lines changed: 0 additions & 28 deletions b/‎ch08-conditional-logic/9b-challenge.py
Lines changed: 0 additions & 28 deletions
@@ -6,15 +6,20 @@
 
 
 # Exercise 1
-# Simulate the toss of a die
-print(randint(1, 6))
+# Write a function that simulatee the roll of a die.
+def roll():
+    """Return random integer between 1 and 6"""
+    return randint(1, 6)
 
 
 # Exercise 2
-# Simulate 10,000 throws of dice and display the average result
-trials = 10000
+# Simulate 10,000 rolls of a die and display the average number rolled.
+num_rolls = 10_000
 total = 0
-for trial in range(0, trials):
-    total += randint(1, 6)
-avg_result = total / trials
-print(f"The average result of {trials} throws was {avg_result}")
+
+for trial in range(num_rolls):
+    total = total + roll()
+
+avg_roll = total / num_rolls
+
+print(f"The average result of {num_rolls} rolls is {avg_roll}")
@@ -0,0 +1,55 @@
+# 8.9 - Challenge: Simulate a Coin Toss Experiment
+# Solution to challenge
+
+
+# Simulate the results of a series of coin tosses and track the results
+
+# This one is tricky to structure correctly. Try writing out the logic before
+# you start coding. Some additional pointers if you're stuck:
+# 1. You will need to use a `for` loop over a range of trials.
+# 2. For each trial, first you should check the outcome of the first flip.
+# 3. Make sure you add the first flip to the total number of flips.
+# 4. After the first toss, you'll need another loop to keep flipping while you
+#    get the same result as the first flip.
+
+import random
+
+
+def coin_flip():
+    """Randomly return 'heads' or 'tails'."""
+    if random.randint(0, 1) == 0:
+        return "heads"
+    else:
+        return "tails"
+
+
+flips = 0
+num_trials = 10_000
+
+for trial in range(num_trials):
+    if coin_flip() == "heads":
+        # Increment the number of flips by 1
+        flips = flips + 1
+        while coin_flip() == "heads":
+            # Keep incrementing the total number of flips
+            # until "tails" is returned by coin_flip()
+            flips = flips + 1
+        # Once coin_flip() return "tails", the loop will exit,
+        # but we need to add one more to flips to track the
+        # last flip that generated "tails"
+        flips = flips + 1
+    else:
+        # coin_flip() returned "tails" on the first flip.
+        # Increment the number of flips by 1
+        flips = flips + 1
+        while coin_flip == "tails":
+            # Keep incrementing the total number of flips
+            # until "heads" is returned by coin_flip()
+            flips = flips + 1
+        # Once coin_flip() returns "heads", the loop will exit,
+        # but we need to add one more to flips to track the
+        # last flip that generated "heads"
+        flips = flips + 1
+
+avg_flips_per_trial = flips / num_trials
+print(f"The average number of flips per trial is {avg_flips_per_trial}.")
@@ -0,0 +1,42 @@
+# 8.9 - Challenge: Simulate a Coin Toss Experiement
+# Alternative solution to challenge
+
+
+# Simulate the results of a series of coin tosses and track the results
+
+# This one is tricky to structure correctly. Try writing out the logic before
+# you start coding. Some additional pointers if you're stuck:
+# 1. You will need to use a `for` loop over a range of trials.
+# 2. For each trial, first you should check the outcome of the first flip.
+# 3. Make sure you add the first flip to the total number of flips.
+# 4. After the first toss, you'll need another loop to keep flipping while you
+#    get the same result as the first flip.
+
+import random
+
+
+def coin_flip():
+    """Randomly return 'heads' or 'tails'."""
+    if random.randint(0, 1) == 0:
+        return "heads"
+    else:
+        return "tails"
+
+
+flips = 0
+num_trials = 10_000
+
+for trial in range(num_trials):
+    # Flip the coin once and increment the flips tally by 1
+    first_flip = coin_flip()
+    flips = flips + 1
+    # Continue flipping the coin and updating the tally until
+    # a different result is returned by coin_flips()
+    while coin_flip() == first_flip:
+        flips = flips + 1
+    # Increment the flip tally once more to account for the
+    # final flip with a different result
+    flips = flips + 1
+
+avg_flips_per_trial = flips / num_trials
+print(f"The average number of flips per trial is {avg_flips_per_trial}.")