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Old April 22nd, 2016, 10:37 AM
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Rod Stephens Rod Stephens is offline
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Hi Maximilian,

I'm glad you're enjoying the book. Tell your friends and coworkers!

You're exactly right about getting practice. That's the best way to learn to program, and I wouldn't wait until I'd finished the book. It;s best to experiment with things as you learn them.

This sounds like a good project to work on. I think you can just loop through the letters from right-to-left (with a for loop). Start with a total variable initialized to 0. then when you reach a letter, there are two cases:
  1. If the new letter's value is greater than the value of the letter before it (to the right), then it's a case like IV. In that case subtract the letter's value from a total.
  2. If the new letter's value is not greater than the value of the previous letter, then it's a case like III. In that case add the letter's value to the total.
For example, with XIV you would add the values like this: +5, -1, +10 to get the final value 14.


Let me know if you get stuck.



Rod
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Rod Stephens, Microsoft MVP

Essential Algorithms: A Practical Approach to Computer Algorithms

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Maximilian (April 25th, 2016)