Extract digits at a certain position in a number

Question

number := 111555

How do I get, for instance the first 3 digits (111) and the last 2 digits (55)?

Answer 1

By using simple arithmetic:

func d(num int) (firstThree int, lastTwo int) {
    firstThree = num / 1000
    lastTwo = num % 100
    return
}

Answer 2

This function gives the digit at a specific place:

func digit(num, place int) int {
    r := num % int(math.Pow(10, float64(place)))
    return r / int(math.Pow(10, float64(place-1)))
}

For example digit(1234567890, 2) gives 9 and digit(1234567890, 6) gives 5.