Instructions

Your friend Chandler plans to visit exotic countries all around the world. Sadly, Chandler's math skills aren't good. He's pretty worried about being scammed by currency exchanges during his trip - and he wants you to make a currency calculator for him.

Here are his specifications for the app.

1. Keep track of different currencies

You have created a enum currency_t to keep track of different currencies Chandler uses in his travels:

You sometimes need to print those currencies on the screen so you can check if they are right.

Create the stringify_currency function:

This function has no return value and should store a C-style string in the location indicated by buffer. The string should visually represent which kind of currency was passed to the function:

2. Check the exchange rate

Create the exchange_rate function:

The domestic_currency argument represents Chandler's local currency to be exchanged for a foreign_currency.

value_in_US_dollars is a pointer to an array of double that contains the value of one unit of each currency in US dollars. Currencies are indexes in this array. So, if EUR is a valid element for enum currency_t, then value_in_US_dollars[EUR] yields the value of 1 EUR in US dollars.

This function should return the value of one unit of foreign currency in the domestic currency.

3. Calculate value of bills

Create the get_value_of_bills function:

The argument denomination is the value of a single bill, whereas number_of_bills is the total number of bills.

This exchanging booth only deals in cash of certain increments. The total you receive must be divisible by the value of one "bill" or unit, which can leave behind a fraction or remainder. Your function should return only the total value of the bills (excluding fractional amounts) the booth would give back. Unfortunately, the booth gets to keep the remainder/change as an added bonus.

4. Calculate number of bills

Create the get_number_of_bills function:

This function should return the number of currency bills that you can receive within the given amount. In other words: How many whole bills of currency fit into the starting amount? Remember -- you can only receive whole bills, not fractions of bills, so remember to divide accordingly. Effectively, you are rounding down to the nearest whole bill/denomination.

5. Calculate value after exchange

Create the exchangeable_value function:

Parameter spread is the percentage taken as an exchange fee, written as an integer. It needs to be converted to decimal by dividing it by 100. Note that the spread is added to the exchange rate, so that a spread of 10 results in a exchange rate 10% higher.

This function should return the maximum value of the new currency after calculating the exchange rate adjusted by the spread. Remember that the currency denomination is a whole number, and cannot be sub-divided.