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

Converting a BigInt to String or Integer in Go

In Golang, a big integer (bigint) is often represented with big.Int. Sometimes, there arises a need to convert this bigint into a string (string) or a regular integer (int).

Converting to String

To convert a bigint to a string, use the String method of big.Int. It returns a string representation of the bigint.

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

Here, bigstr will store the string representation "123".

Converting to Integer

Converting a bigint to an integer is not a straightforward process. However, if you are certain that the bigint can be represented in the range of an int, you can use the Int64 method, which returns a 64-bit integer value representing the bigint.

bigint := big.NewInt(123)
int64int := bigint.Int64()

However, note that if the bigint cannot be represented in the range of an int, it will panic.

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