Fibonacci Sequence

I was trying to create a code to calculate the nth number in a Fibonacci sequence, when the nth number is entered interactively.

Any help would be much appreciated
Where are you stuck at?
http://en.wikipedia.org/wiki/Fibonacci_number
This has the recursive definition right at the top. Just convert that into code and you're set.
Might be that the values are getting too big. I tried this before on the forum and was only able to get to the 93rd fib before the variable type I was using began to degrade.

http://www.cplusplus.com/forum/general/93643/#msg502709
I don't think OP is having that issue. I don't think he has even gotten any code for this yet.
I wasn't sure where to start coding in the first place, So should I just convert the recursive numbers into code and that's me?
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