Fibonacci Program

Hello. Today I am working on a project in which I have to make a program that can solve and print the first twenty numbers of a fibonacci sequence.
I do not want the code for a finished program, just some commands and such that can help me finish.
TL;DR: I need some commands to solve an equation.
Once you have the formula, it's trivial to write a working program:

 ``1234567891011`` ``````#include #include int main() { double phi = (1 + std::sqrt(5))/2; for(int n = 1; n <= 20; ++n) { unsigned int fib = std::pow(phi, n)/sqrt(5) + 0.5; std::cout << fib << '\n'; } }``````

online demo: http://ideone.com/hLsoWY
Fibonacci sequence is fun!

1, 1, 2, 3, 5, 8,....

What is so hard?

every iteration you add 2 last number to following number

1+1=2
1+2=3
2+3=5
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No but I am making a program to do that for me, insead of by hand.
This could be simple. You need to use some loops to accomplish this task.
Also, this code is less obfuscated than some of the previous examples given.

 ``1234567891011121314151617181920`` ``````int main() { int original = 0; int next = 1; int final = 0; int amount = 20; cout << original << ", "; cout << next << ", "; for (int i = 0; i < amount; i++) { final = original + next; cout << final << ", "; original = next; next = final; } getchar(); return 0; }``````
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