How to Convert a Big Int to a String or Integer in Go?

Converting a Big Int to String or Integer in Go

When working with large integers in Golang, it may be necessary to convert them to strings or regular integers for display or mathematical operations. The math/big package provides functionality to handle these conversions efficiently.

Converting to a String:

To convert a big int into a string representation, use the String() method provided by the big.Int type:

package main

import (
    "fmt"
    "math/big"
)

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

Converting to an Integer:

To convert a big int into an integer (int64), use the Int64() method:

package main

import (
    "fmt"
    "math/big"
)

func main() {
    bigint := big.NewInt(123)
    int64val := bigint.Int64()
    fmt.Println(int64val) // Output: 123
}

Note that the Int64() method only works for big ints that can fit into an int64. For larger integers, use the Bytes() method to get the underlying byte representation and convert it accordingly.

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