go语言 – 变参函数示例

现在我们通过一个示例，来加深对变参函数的理解。

示例

判断输入的变参参数值中是否有某个整数。

package main

import (  
    "fmt"
)

func find(num int, nums ...int) {  
    fmt.Printf("type of nums is %T\n", nums)
    found := false
    for i, v := range nums {
        if v == num {
            fmt.Println(num, "found at index", i, "in", nums)
            found = true
        }
    }
    if !found {
        fmt.Println(num, "not found in ", nums)
    }
    fmt.Printf("\n")
}
func main() {  
    find(89, 89, 90, 95)
    find(45, 56, 67, 45, 90, 109)
    find(78, 38, 56, 98)
    find(87)
}

以上程序输出：

type of nums is []int  
89 found at index 0 in [89 90 95]

type of nums is []int  
45 found at index 2 in [56 67 45 90 109]

type of nums is []int  
78 not found in  [38 56 98]

type of nums is []int  
87 not found in  []