如何在GoLang中的init中声明两个变量？ [重复]

Question

This question already has an answer here:

• Can you declare multiple variables at once in Go? 5 answers

when i write:

package main

import (
    "fmt"
)

func Sqrt(x float64) float64 {
    var ret float64

    for z := 1.0, n := 0;n < 10;n++ {
        ret = z - (z*z - x) / 2*z
    }
    return ret
}

func main() {
    fmt.Println(Sqrt(2))
}

syntax error: z := 1.0, n used as value. and bring

z := 1.0

out of the for block below

package main

import (
    "fmt"
)

func Sqrt(x float64) float64 {
    var ret float64
    z := 1.0
    for n := 0;n < 10;n++ {
        ret = z - (z*z - x) / 2*z
    }
    return ret
}

func main() {
    fmt.Println(Sqrt(2))
}

it's ok so how can i define two variables in init of the for block?

</div>

Answer 1

A For clause has an Init Statement which is a Simple Statement, including only one Assigment

So in your case, you cannot declare multiple variable with different type/values. You could use a tuple assignment though

for z, n := 1.0, 0; n < 10; n++ {

(playground)