【C言語】フィボナッチ数列の性質

#include <stdio.h>
#include <math.h>
#define N 30
const double phi = (1 + sqrt(5)) / 2;
double Fibonacci(int);
int main() {
    int i, n;
    double psi = 0;
    for (i = 1; i <= N; i++) {
        n = i + 1;
        psi = psi + Fibonacci(i) / pow(10, n);
        printf("%f -> %f \r\n",1/89.0,  psi);
    }
}

double Fibonacci(int i) {
    return (pow(phi, i) - pow(-phi, -i)) / sqrt(5);
}