语句末尾出现意外的<type>

Question

The Go code is below.

Error Message: syntax error: unexpected float64 at end of statement in line 9.

package main

import (
    "fmt"
    "math"
)

func pow(x, n, lim float64) float64 {
    v float64 = math.Pow(x,n) // line 9
    if v<lim {
        return v
    } else {
        fmt.Printf("%g >= %g
", v, lim)
    }   
    return lim 
}

func main() {
    fmt.Println(
        pow(3, 2, 10),
        pow(3, 2, 20),
    )   
}

I don't know what is wrong. Who know that?

Answer 1

Change line 9 to either of statements below:

v := math.Pow(x,n) // implicit type declaration and assignment

or

var v float64 = math.Pow(x,n) // explicit type declaration and assignment

See short variable declarations.