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