function myFib(n) {
if (isNaN(n) || Math.floor(n) !== n)
return "Not an integer value!";
if (n === 0 || n === 1)
return 3;
else
return myFib(n - 1) + myFib(n - 2);
}
console.log(myFib(5));
//x is the index number in the fibonnacci sequence.
//The function will return that index's fibonacci value
function fib(x) {
let a = 0;
let b = 1;
for (var i = 0; i < x-1; i++) {
let c = b;
b += a;
a = c;
}
return b;
}
int n ;
double feb = (1/Math.pow(5,0.5)) * (Math.pow((1+Math.pow(5,0.5))/2,n)) - (1/Math.pow(5,0.5))* (Math.pow((1-Math.pow(5,0.5))/2,n));