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// $G $D/$F.go && $L $F.$A && ./$A.out

// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package main

import "fmt"

const (
        a = iota
        b
        c
        d
        e
)

var x = []int{1, 2, 3}

func f(x int, len *byte) {
        *len = byte(x)
}

func whatis(x interface{}) string {
        switch xx := x.(type) {
        default:
                return fmt.Sprint("default ", xx)
        case int, int8, int16, int32:
                return fmt.Sprint("signed ", xx)
        case int64:
                return fmt.Sprint("signed64 ", int64(xx))
        case uint, uint8, uint16, uint32:
                return fmt.Sprint("unsigned ", xx)
        case uint64:
                return fmt.Sprint("unsigned64 ", uint64(xx))
        case nil:
                return fmt.Sprint("nil ", xx)
        }
        panic("not reached")
}

func whatis1(x interface{}) string {
        xx := x
        switch xx.(type) {
        default:
                return fmt.Sprint("default ", xx)
        case int, int8, int16, int32:
                return fmt.Sprint("signed ", xx)
        case int64:
                return fmt.Sprint("signed64 ", xx.(int64))
        case uint, uint8, uint16, uint32:
                return fmt.Sprint("unsigned ", xx)
        case uint64:
                return fmt.Sprint("unsigned64 ", xx.(uint64))
        case nil:
                return fmt.Sprint("nil ", xx)
        }
        panic("not reached")
}

func check(x interface{}, s string) {
        w := whatis(x)
        if w != s {
                fmt.Println("whatis", x, "=>", w, "!=", s)
                panic("fail")
        }

        w = whatis1(x)
        if w != s {
                fmt.Println("whatis1", x, "=>", w, "!=", s)
                panic("fail")
        }
}

func main() {
        check(1, "signed 1")
        check(uint(1), "unsigned 1")
        check(int64(1), "signed64 1")
        check(uint64(1), "unsigned64 1")
        check(1.5, "default 1.5")
        check(nil, "nil <nil>")
}