我可以在go中使用什么数字类型来获得最大的数字？

Question

Assuming the following:

package main

import (
    "fmt"
)

func main() {
    var MaxInt uint64
    MaxInt = 1<<64 - 1
    fmt.Printf("Type: %T Value: %v
", MaxInt, MaxInt)
}

I get the results of:

Type: uint64 Value: 18446744073709551615

Just as expected.

However, say I want to get a larger, say 1<<256 - 1, when I use

func main() {
    x:= 1<<256-1
    fmt.Printf("Type: %T Value: %v
", x, x)
}

I get:

./prog.go:10:10: constant 115792089237316195423570985008687907853269984665640564039457584007913129639936 overflows int

For x:=1<<512-1 I get:

./prog.go:10:10: shift count too large: 512

My question is: What types can I use go to play with large numbers at this scale?

Answer 1

You can use math/big package. It contains types Int, Float, Rat (rational).