This is a common programming puzzle, here is a swift 2.2 implementation The application is delevoped with the latest version of swift (2.2) and tested for ios 9.2 Unit tests are provided
The application's main user interface is developed using stack views, nothing fancy about it, it has following components
1, Input text view
A pre populated text view with test input ready, but can be edited at will
2, Output text view
Displays the test result, it clears the text every time a new test is about to run
3, Run test button
A button to run the test
Build and run in iPhone, the app user interface is provided with preloaded test input, you can run the test by taping the Run test button.
You decided to give up on earth after the latest financial collapse left 99.99% of the earth's population with 0.01% of the wealth. Luckily, with the scant sum of money that is left in your account, you are able to afford to rent a spaceship, leave earth, and fly all over the galaxy to sell common metals and dirt (which apparently is worth a lot).Buying and selling over the galaxy requires you to convert numbers and units, and you decided to write a program to help you.The numbers used for intergalactic transactions follows similar convention to the roman numerals and you have painstakingly collected the appropriate translation between them.Roman numerals are based on seven symbols:
SymbolValue
- I 1
- V 5
- X 10
- L 250
- C 100
- D 500
- M 1,000
Numbers are formed by combining symbols together and adding the values. For example, MMVI is 1000 + 1000 + 5 + 1 = 2006. Generally, symbols are placed in order of value, starting with the largest values. When smaller values precede larger values, the smaller values are subtracted from the larger values, and the result is added to the total. For example MCMXLIV = 1000 + (1000 - 100) + (50 - 10) + (5 - 1) = 1944. The symbols "I", "X", "C", and "M" can be repeated three times in succession, but no more. (They may appear four times if the third and fourth are separated by a smaller value, such as XXXIX.) "D", "L", and "V" can never be repeated.
"I" can be subtracted from "V" and "X" only. "X" can be subtracted from "L" and "C" only. "C" can be subtracted from "D" and "M" only. "V", "L", and "D" can never be subtracted. Only one small-value symbol may be subtracted from any large-value symbol.
A number written in Arabic numerals can be broken into digits. For example, 1903 is composed of 1, 9, 0, and 3. To write the Roman numeral, each of the non-zero digits should be treated separately. In the above example, 1,000 = M, 900 = CM, and 3 = III. Therefore, 1903 = MCMIII. -- Source: Wikipedia (http://en.wikipedia.org/wiki/Roman_numerals)Input to your program consists of lines of text detailing your notes on the conversion between intergalactic units and roman numerals. You are expected to handle invalid queries appropriately.
Test input:
glob is I
prok is V
pish is X
tegj is L
glob glob Silver is 34 Credits
glob prok Gold is 57800 Credits
pish pish Iron is 3910 Credits
how much is pish tegj glob glob ?
how many Credits is glob prok Silver ?
how many Credits is glob prok Gold ?
how many Credits is glob prok Iron ?
how much wood could a woodchuck chuck if a woodchuck could chuck wood ?
Test Output:
pish tegj glob glob is 42
glob prok Silver is 68 Credits
glob prok Gold is 57800 Credits
glob prok Iron is 782 Credits
I have no idea what you are talking about
1, A galaxy numeral is any word that is provided with a mapped roman numeral
examples
glob is I
jank is M
2, A metal can be any metal which is can be unknown metal also, a metal is identified from a statement with a particular format
example
glob glob Silver is 34 Credits
glob glob Mercury is 344 Credits
Logic
The logic of the program is to identify the galaxy numerals and convert them into galaxy numbers , then galaxy number is converted into Roman number and eventually Arabic numbers.
Price of each metal is mapped with its name and unit price. Total credits for a given quantity of metal is calculated from this data