[英]How to convert []string to []float64 in Golang?
I'm new to programming, and trying to write a simple average program in Go. 我是编程的新手,并试图在Go中编写一个简单的平均程序。
package main
import (
"fmt"
"os"
)
var numbers []float64
var sum float64 = 0
func main() {
if len(os.Args) > 1 {
numbers = os.Args[1:]
}
fmt.Println("Numbers are: ", numbers)
for _, value := range numbers {
sum += value
}
}
http://play.golang.org/p/TWNltPO71N http://play.golang.org/p/TWNltPO71N
when I build the program, I got this error: 当我构建程序时,我收到了这个错误:
prog.go:15: cannot use os.Args[1:] (type []string) as type []float64 in assignment
[process exited with non-zero status]
So how to convert a slice of string to a slice of float numbers? 那么如何将一片字符串转换为一个浮点数? Can I map a convert function to the slice?
我可以将转换函数映射到切片吗?
You need to convert string to float64 using strconv.ParseFloat function: 您需要使用strconv.ParseFloat函数将字符串转换为float64:
package main
import (
"fmt"
"os"
"strconv"
)
var numbers []float64
var sum float64 = 0
func main() {
if len(os.Args) <= 1 {
return
}
for _, arg := range os.Args[1:] {
if n, err := strconv.ParseFloat(arg, 64); err == nil {
numbers = append(numbers, n)
}
}
fmt.Println("Numbers are: ", numbers)
for _, value := range numbers {
sum += value
}
}
It can't convert because string
and int
are not compatible. 它无法转换,因为
string
和int
不兼容。
Instead of having the numbers
slice, just iterate over os.Args[1:]
, using ParseFloat from the strconv
package. 代替具有的
numbers
片,只是遍历os.Args[1:]
,使用ParseFloat从strconv
包。
fmt.Print("Numbers are: ")
for _, arg := range os.Args[1:] {
fmt.Print(arg, " ")
value, err := strconv.ParseFloat(arg, 64)
if err != nil {
panic(err)
}
sum += value
}
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