74 lines
1.4 KiB
Go
74 lines
1.4 KiB
Go
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// For more tutorials: https://blog.learngoprogramming.com
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//
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// Copyright © 2018 Inanc Gumus
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// Learn Go Programming Course
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// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
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//
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package main
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import "fmt"
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func main() {
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nums := []int{2, 3, 7}
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fmt.Printf("nums : %d\n", nums)
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n := avgNoVariadic(nums)
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fmt.Printf("avgNoVariadic : %d\n", n)
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n = avg(2, 3, 7)
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fmt.Printf("avg(2, 3, 7) : %d\n", n)
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n = avg(2, 3, 7, 8)
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fmt.Printf("avg(2, 3, 7, 8) : %d\n", n)
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// use ... to pass a slice
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n = avg(nums...)
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fmt.Printf("avg(nums...) : %d\n", n)
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// uses the existing slice
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double(nums...)
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fmt.Printf("double(nums...) : %d\n", nums)
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// creates a new slice
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double(4, 6, 14)
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fmt.Printf("double(4, 6, 14): %d\n", nums)
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// creates a nil slice
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fmt.Printf("\nmain.nums : %p\n", nums)
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investigate("passes main.nums", nums...)
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investigate("passes main.nums", nums...)
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investigate("passes args", 4, 6, 14)
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investigate("passes args", 4, 6, 14)
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investigate("no args")
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}
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func investigate(msg string, nums ...int) {
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fmt.Printf("investigate.nums: %12p -> %s\n", nums, msg)
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if len(nums) > 0 {
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fmt.Printf("\tfirst element: %d\n", nums[0])
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}
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}
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func double(nums ...int) {
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for i := range nums {
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nums[i] *= 2
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}
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}
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func avg(nums ...int) int {
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return sum(nums) / len(nums)
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}
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func avgNoVariadic(nums []int) int {
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return sum(nums) / len(nums)
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}
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func sum(nums []int) (total int) {
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for _, n := range nums {
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total += n
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}
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return
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}
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