modulus - How to test whether a float is a whole number in Go?

Question

I originally tried this, however the % operator isn't defined for float64.

func main(){
    var a float64
    a = 1.23
    if a%1 == 0{
        fmt.Println("yay")
    }else{
        fmt.Println("you fail")
    }
}

Answer 1

Waitting for answers