Calculating Fibonacci Number accurately in C++?

Question

I am really confused. I am trying to calculate Fibonacci numbers, but as they get larger and large the numbers start to become wrong. and I do not know why.

How do y

Answer 1

In general, floats and doubles are not designed to represent numbers accurately. Their purpose is to represent real numbers in a wide range. If you do want infinite precision, you could try looking into http://gmplib.org/