Dynamically initialize array size in go

Question

I try to write a small application in go that takes 'x' numbers of integers from standard input, calculates the mean and gives it back. I have only gotten so far:

func main() { var elems, mean int sum := 0  fmt.Print("Number of elements? ")  fmt.Scan(&elems)  var array = new([elems]int)  for i := 0; i < elems; i++ {     fmt.Printf("%d . Number? ", i+1)     fmt.Scan(&array[i])     sum += array[i]; }............ 

When trying to compile this I get the following error message:

invalid array bound elems

What is wrong here?

Answer 1

You should use a slice instead of an array:

//var array = new([elems]int) - no, arrays are not dynamic var slice = make([]int,elems) // or slice := make([]int, elems) 

See "go slices usage and internals".

Also you may want to consider using range for your loop:

// for i := 0; i < elems; i++ { - correct but less idiomatic for i, v := range slice {