Format printing the 64bit integer -1 as hexadecimal deviates between golang and C [closed]

Answer 1

int64(math.MaxUint64) overflows the range of int64:

package main

import (
    "fmt"
    "math"
)

func main() {
    var x uint64 = 1<<64 - 1
    fmt.Printf("%v\n", math.MaxUint64 == x) // true

    var y int64 = 1<<63 - 1
    fmt.Printf("%v\n", math.MaxInt64 == y) // true

    var z int64 = int64(x) // -1
    fmt.Printf("%v\n", z)
}

Playground: https://play.golang.org/p/J6buiaaZcFt

see https://golang.org/pkg/math/#pkg-constants and https://play.golang.org/p/iul2dgRbK2E