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python/currency-exchange/HINTS.md

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+# Hints
+
+## General
+
+- [The Python Numbers Tutorial][python-numbers-tutorial] and [Python numeric types][python-numeric-types] can be a great introduction.
+
+## 1. Estimate value after exchange
+
+- You can use the [division operator][division-operator] to get the value of exchanged currency.
+
+## 2. Calculate currency left after an exchange
+
+- You can use the [subtraction operator][subtraction-operator] to get the amount of change.
+
+## 3. Calculate value of bills
+
+- You can use the [multiplication operator][multiplication-operator] to get the value of bills.
+
+## 4. Calculate number of bills
+
+- You need to divide `amount` into `denomination`.
+- You need to use type casting to `int` to get the exact number of bills.
+- To remove decimal places from a `float`, you can convert it to `int`.
+
+  **Note:** The `//` operator also does floor division. But, if the operand has `float`, the result is still `float`.
+
+## 5. Calculate leftover after exchanging into bills
+
+- You need to find the remainder of `amount` that does not equal a whole `denomination`.
+- The Modulo operator `%` can help find the remainder.
+
+## 6. Calculate value after exchange
+
+- You need to calculate `spread` percent of `exchange_rate` using multiplication operator and add it to `exchange_rate` to get the exchanged currency.
+- The actual rate needs to be computed. Remember to add exchange _rate_ and exchange _fee_.
+- You can get exchanged money affected by commission by using divide operation and type casting to `int`.
+
+
+[division-operator]: https://docs.python.org/3/tutorial/introduction.html#numbers
+[multiplication-operator]: https://docs.python.org/3/tutorial/introduction.html#numbers
+[python-numbers-tutorial]: https://docs.python.org/3/tutorial/introduction.html#numbers
+[python-numeric-types]: https://docs.python.org/3.9/library/stdtypes.html#numeric-types-int-float-complex
+[subtraction-operator]: https://docs.python.org/3/tutorial/introduction.html#numbers