# greeter.py, M1 solution: a personalized tip helper.
# Every line is explained so you can read it like a sentence.
# Run it in Google Colab (paste into a cell) OR on any computer with: python greeter.py

# --- 1. Ask the person some questions (input) -------------------------------
# input() prints the question, waits for them to type, and hands back TEXT.
name = input("What's your name? ")
bill_text = input("How much was the bill? ")
tip_text  = input("What tip % do you want to leave? ")

# --- 2. Turn the text answers into numbers (types) --------------------------
# input() always gives TEXT (a string). To do maths we convert to a number.
# float() = a number that can have decimals (like 42.50).
bill = float(bill_text)
tip_percent = float(tip_text)

# --- 3. Do the maths (numbers) ----------------------------------------------
tip = bill * tip_percent / 100   # the tip in dollars
total = bill + tip               # what they actually pay

# --- 4. Say something back, personalized (output + f-string) ----------------
# An f-string lets us drop variables straight into a sentence with { }.
# The :.2f rounds a number to 2 decimal places, like money.
print(f"\nThanks, {name}! Here's your bill:")
print(f"  Bill:  ${bill:.2f}")
print(f"  Tip:   ${tip:.2f}  ({tip_percent:.0f}%)")
print(f"  Total: ${total:.2f}")
print(f"\nYou wrote a real program, {name}. ")