Hyperia Forex

static <return type> operator <operator symbols>(<parameters>);

static (explicit|implicit) operator <cast-to-type>(<cast-from-type> <parameter name>);

Instructions

You've been tempted back to Hyperia (with the high inflation) for an eye watering daily rate.

The Central Bank is contemplating introducing the US Dollar as a second currency so all the accounting systems have to be adapted to handle multiple currencies.

You have been asked to implement the currency amount object.

1. Enable the currency amount to be tested for equality

Please modify the CurrencyAmount struct to handle equality. If the two currency amount structs do not have the same currency ("USD" or "HD") then an instance of ArgumentException should be thrown.

CurrencyAmount amountA = new CurrencyAmount(55, "HD");
CurrencyAmount amountB = new CurrencyAmount(55, "HD");
CurrencyAmount amountC = new CurrencyAmount(55, "USD");
amountA == amountB
// => true
amountA != amountB
// => false
amountA == amountC
// => ArgumentException
amountA != amountC
// => ArgumentException

2. Compare currency amounts

Please modify the CurrencyAmount struct to handle comparisons (> and <, only). If the two currency amount structs do not have the same currency ("USD" or "HD") then an instance of ArgumentException should be thrown.

CurrencyAmount amountA = new CurrencyAmount(55, "HD");
amountA > new CurrencyAmount(50, "HD")
// => true
amountA < new CurrencyAmount(50, "HD")
// => false
amountA > new CurrencyAmount(50, "USD")
// => ArgumentException

3. Add and subtract currency amounts

Please modify the CurrencyAmount struct to handle arithmetic addition and subtraction (+ and -, only). If the two currency amount structs do not have the same currency ("USD" or "HD") then an instance of ArgumentException should be thrown.

CurrencyAmount amountA = new CurrencyAmount(55, "HD");
CurrencyAmount amountB = new CurrencyAmount(100, "HD");
CurrencyAmount amountC = new CurrencyAmount(55, "USD");
amountA + amountB
// => {155, HD}
amountB - amountA
// => {45, HD}
amountA + amountC
// => ArgumentException

4. Multiply and divide currency amounts

Please modify the CurrencyAmount struct to handle arithmetic multiplication and division (* and /, only).

CurrencyAmount amountA = new CurrencyAmount(10, "HD");
amountA * 2m
// => {20, HD}
amountA / 2m
// => {5, HD}

5. Convert the currency amount to a double

Please modify the CurrencyAmount struct so that an instance can be explicitly cast to a double.

CurrencyAmount amountA = new CurrencyAmount(55.5m, "HD");
(double)amountA
// => 55.5d

6. Convert the currency amount to a decimal

Please modify the CurrencyAmount struct so that an instance can be implicitly converted to a decimal.

CurrencyAmount amountA = new CurrencyAmount(55.5m, "HD");
decimal d = amountA;
// => d == 55.5m