How to Convert a Go `big.Int` to a String or Integer?

Converting a BigInt to String or Integer in Go

Problem:

When working with large integer values represented as big.Int types in Go, it may become necessary to convert them to string or integer representations for various reasons. How can one accomplish this conversion?

Solution:

To convert a big.Int to a string, simply use the String method, which returns the integer value as a string. For example:

bigint := big.NewInt(123)
bigstr := bigint.String()

This will assign the string representation "123" to the bigstr variable.

To convert a big.Int to an integer, use the Int64 or Uint64 method. Int64 returns the integer value as a 64-bit signed integer, while Uint64 returns it as a 64-bit unsigned integer. For example:

bigint := big.NewInt(123)
int64Value := bigint.Int64()
uint64Value := bigint.Uint64()

fmt.Println(int64Value) // Prints "123"
fmt.Println(uint64Value) // Prints "123"

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