How Do I Convert a Go BigInt to a String or Integer?

Converting a BigInt to String or Integer in Go

In Go, a BigInt represents an arbitrarily large integer. Converting a BigInt to a string or integer is a common task when working with large numbers.

Converting to String

To convert a BigInt to a string, use the String method:

package main

import (
    "fmt"
    "math/big"
)

func main() {
    bigint := big.NewInt(123)
    bigstr := bigint.String()
    fmt.Println(bigstr) // Output: "123"
}

Converting to Integer

To convert a BigInt to an integer, use the Int64 method if you want an int64 or the Uint64 method if you want a uint64. These methods will return the integer value of the BigInt if it fits within the respective integer type. If the BigInt is too large, these methods will return 0.

package main

import (
    "fmt"
    "math/big"
)

func main() {
    bigint := big.NewInt(123)
    int64Value := bigint.Int64()
    uint64Value := bigint.Uint64()
    fmt.Println(int64Value)  // Output: 123
    fmt.Println(uint64Value) // Output: 123
}

Note that the conversion to an integer may result in data loss if the BigInt is too large to fit into the integer type.

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