package mainimport(  "fmt")type TestInterface interface{}func main(){  a:=65 // char A ‘s ascii code  b:=float64(a)  c:=string(a)  fmt.Println(a)  fmt.Println(b)  fmt.Println(c) // A  //fmt.Println(c==nil)//error  var ti TestInterface  fmt.Println(ti == nil)  fmt.Println("convert int to string vs string‘s empty", c=="") //false  var s string  fmt.Println("convert int to string vs string‘s empty", s=="") // true}