I need help coding this calculation

This is math calculation that i need to program - define sequence a_n as

• a₁ = 1
• a_(n+1) = 1 / (2 × [a_n] - a_n + 1) where [x] is the floor function

If a₂₀₁₄ = p/q, find p + q

And, this is the code I tried:

#include <stdio.h>
#include <math.h>

main() {
   int n=1;
   double an=1.0;
   double an_floor=0.0;

   while (n<=2014) {
      an_floor = floor(an);
      an = 1 / (2*an_floor-an+1);
      n = n + 1;
   }

   printf("%lf", an);

   return 0;
}

Problems;

• I cannot compile (using web complier such as codepad, etc.)

• Don't know how to make result

• Fraction result is wrong