Write a method remainder which takes two integer arguments, dividend and divisor, and returns the remainder when dividend is divided by divisor. Do NOT use the modulus operator (%) to calculate the remainder!
Dividend will always be greater than or equal to divisor.
Make sure the implemented remainder function works exactly the same as the Modulus Operator (%). For example n % 0 = NaN, your method should return null.
Some Random Test Cases are waiting up ahead...
SimpleInteger is a tiny and immutable implementation of an integer number. Its interface is a very small subset of the java.math.BigInteger API:
#add(SimpleInteger val)#subtract(SimpleInteger val)#multiply(SimpleInteger val)#divide(SimpleInteger val)#compareTo(SimpleInteger val)