[alan] Adds sieve and fizzbuzz programs and 42

[purpl3F0x]

Adds 3 programs and their accompanied test files to the alan collection:

• Sieve of Eratosthenes
• FizzBuzz
• The answer to life

[kostis]

Thanks for the PR. The answer program is a bit strange because it requires reading some integer but does not do anything with it. I can see that it may result in a (justifiable) warning by some compilers. I'd rather not have test programs that produce warnings.

I suggest you change it to either not take any input or do something with that input and e.g. produce 42.

[purpl3F0x]

Thanks for the PR. The answer program is a bit strange because it requires reading some integer but does not do anything with it. I can see that it may result in a (justifiable) warning by some compilers. I'd rather not have test programs that produce warnings.

I suggest you change it to either not take any input or do something with that input and e.g. produce 42.

I've made a typo when transferring the file, the program wasn't valid.
I amended the commit with a correct one, which hopefully makes more sense.

[kostis]

Is better now - I'll merge it. Thanks again.