func main() { prod := bigint.BigInt{[]int{1}} for i := 0; i < 1000; i++ { prod.Mult(2) } println(prod.DigitSum()) }
func main() { fact := bigint.BigInt{[]int{1}} for i := 1; i <= 100; i++ { fact.Mult(i) } println(fact.String()) println(fact.DigitSum()) }