Each new term in the Fibonacci sequence is generated by adding the previous two terms. By starting with 1 and 2, the first 10 terms will be:
1, 2, 3, 5, 8, 13, 21, 34, 55, 89, …
By considering the terms in the Fibonacci sequence whose values do not exceed four million, find the sum of the even-valued terms.
package main
import (
"fmt"
)
func main() {
var total int
total = 0
fibbCalc(&total, 2, 1)
fmt.Println(total)
}
func fibbCalc(sum *int, x int, y int) {
if (x & 0x1) == 0 {
*sum += x
}
if x >= 4000000 {
return y
}
return fibbCalc(sum, x+y, x)
}