高朗的布尔型

How do I return a true or false from a function and then check it. This code returns an error: mismatched types func() bool and bool

func d() bool {
    var e bool
    return e
}

if d == true {
    fmt.Printf("true")
}

You're comparing the actual function to true, not the function result, you need to call the function, e.g.

func d() bool {
    var e bool
    return e
}

if d() {
    fmt.Printf("true")
}