Why am I seeing this error "./main.go:7:6: syntax error: unexpected mars, expecting ("?-CodePudding

Here is my program. I am trying to convert a person's age on mars. It looks everything is fine here but still I am getting this error

package main
import "fmt"

func main() {
var age int
fmt.Scanln(&age)
func mars(age) int{
days := age*365
return days/687
}
mars_age := mars(age)
fmt.Println(mars_age)
}

CodePudding user response：

Try:

package main

import "fmt"

func mars(age int) int {
    days := age * 365
    return days / 687
}
func main() {
    var age int
    fmt.Scanln(&age)

    mars_age := mars(age)
    fmt.Println(mars_age)
}

Named func's must be at the same level (i e. main, mars)
Function parameters must have types age int

NOTE Go permits anonymous functions (aka lambdas) too. In that case, you could define mars in main and you could assign it to a variable e.g. mars := func(age int) int { ... }

CodePudding user response：

Please see this post on how to use nested functions https://stackoverflow.com/a/42423998/2693654

You need to have something like:

package main
import "fmt"

func main() {
    var age int
    fmt.Scanln(&age)
    x:= func (age int) int {
        days := age*365
        return days/687
    }
    mars_age := x(age)
    fmt.Println(mars_age)
}

CodePudding user response：

Please look at this picture...