Exercism/julia/currency-exchange/HINTS.md

Hints

General

1. Estimate value after exchange

• You can use the division operator to get the value of exchanged currency.

2. Calculate currency left after an exchange

• You can use the subtraction operator to get the amount of change.

3. Calculate value of bills

• You can use the multiplication operator to get the value of bills.

4. Calculate number of bills

• You need to divide amount into denomination.

• To remove decimal places from a floating point value, you can use the floor() function.

• You need an integer to get the exact number of bills. The floor function can take the desired output type as a parameter.

  Note: The ÷ operator, or div() function, also does floor division. However, if an operand is floating point the result is still floating point.

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 a divide operation, plus type casting to integer if necessary.