如何在Golang中将uint64转换为big.Int？

Question

I was wondering how can I convert a uint64 to big.Int in golang? the shortest way.

I have tried new(big.Int).SetInt64(int64(a uint64 number)).

I don't like it cause it's long, too much nested conversions and I'd rather use a built-in function if it exists.

Answer 1

Shortest and safest would be to use the Int.SetUint64() method:

var x uint64 = 10

i := new(big.Int).SetUint64(x)

fmt.Println(i) // Prints 10

Try it on the Go Playground.

Care should be taken when manually converting uint64 to int64 (as in your example), as overflow might happen which you won't be notified about, but you will end up with a negative value.

If you can be sure the value fits into an int64, using the big.NewInt() function is shorter:

i := big.NewInt(int64(x))

Try this one on the Go Playground.