From 8e66cbbcc2c393123a916b2ff82562f859f37ba7 Mon Sep 17 00:00:00 2001
From: Dave LeCompte <tsmaster@gmail.com>
Date: Tue, 2 Mar 2021 22:43:52 -0800
Subject: [PATCH] port CHANGE to Python

straightforward change(CHANGE!), the biggest modification is that it's considered bad practice to use floating point numbers for dollars, so I converted the entire program to pennies. Exercise for the reader, how about using locale information to try to guess what currency system the user is using?

Also, this clearly comes from a time before ATMs making $20 bills super common.
---
 22 Change/python/change.py | 113 +++++++++++++++++++++++++++++++++++++
 1 file changed, 113 insertions(+)
 create mode 100644 22 Change/python/change.py

diff --git a/22 Change/python/change.py b/22 Change/python/change.py
new file mode 100644
index 00000000..cb9e72e9
--- /dev/null
+++ b/22 Change/python/change.py	
@@ -0,0 +1,113 @@
+"""
+CHANGE
+
+Change calculator
+
+Port by Dave LeCompte
+"""
+
+PAGE_WIDTH = 64
+
+
+def print_centered(msg):
+    spaces = " " * ((PAGE_WIDTH - len(msg)) // 2)
+    print(spaces + msg)
+
+
+def print_header(title):
+    print_centered(title)
+    print_centered("CREATIVE COMPUTING  MORRISTOWN, NEW JERSEY")
+    print()
+    print()
+    print()
+
+
+def print_introduction():
+    print("I, YOUR FRIENDLY MICROCOMPUTER, WILL DETERMINE")
+    print("THE CORRECT CHANGE FOR ITEMS COSTING UP TO $100.")
+    print()
+    print()
+
+
+def pennies_to_dollar_string(p):
+    d = p / 100
+    ds = f"${d:0.2f}"
+    return ds
+
+
+def compute_change():
+    print("COST OF ITEM?")
+    cost = float(input())
+    print("AMOUNT OF PAYMENT?")
+    payment = float(input())
+
+    change_in_pennies = round((payment - cost) * 100)
+    if change_in_pennies == 0:
+        print("CORRECT AMOUNT, THANK YOU.")
+        return
+
+    if change_in_pennies < 0:
+        short = -change_in_pennies / 100
+
+        print(f"SORRY, YOU HAVE SHORT-CHANGED ME ${short:0.2f}")
+        print()
+        return
+
+    print(f"YOUR CHANGE, {pennies_to_dollar_string(change_in_pennies)}")
+
+    d = change_in_pennies // 1000
+    if d > 0:
+        print(f"{d} TEN DOLLAR BILL(S)")
+    change_in_pennies -= d * 1000
+
+    e = change_in_pennies // 500
+    if e > 0:
+        print(f"{e} FIVE DOLLAR BILL(S)")
+    change_in_pennies -= e * 500
+
+    f = change_in_pennies // 100
+    if f > 0:
+        print(f"{f} ONE DOLLAR BILL(S)")
+    change_in_pennies -= f * 100
+
+    g = change_in_pennies // 50
+    if g > 0:
+        print("ONE HALF DOLLAR")
+    change_in_pennies -= g * 50
+
+    h = change_in_pennies // 25
+    if h > 0:
+        print(f"{h} QUARTER(S)")
+    change_in_pennies -= h * 25
+
+    i = change_in_pennies // 10
+    if i > 0:
+        print(f"{i} DIME(S)")
+    change_in_pennies -= i * 10
+
+    j = change_in_pennies // 5
+    if j > 0:
+        print(f"{j} NICKEL(S)")
+    change_in_pennies -= j * 5
+
+    if change_in_pennies > 0:
+        print(f"{change_in_pennies} PENNY(S)")
+
+
+def print_thanks():
+    print("THANK YOU, COME AGAIN.")
+    print()
+    print()
+
+
+def main():
+    print_header("CHANGE")
+    print_introduction()
+
+    while True:
+        compute_change()
+        print_thanks()
+
+
+if __name__ == "__main__":
+    main()