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