golang-超大数字计算

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package main

func main() {
   numstr := "360000000000000000000000000000"
   fmt.Println(BigIntAdd(numstr, 99))
   fmt.Println(BigIntReduce(numstr, 99))
}

func BigIntAdd(numstr string, num int64) string {
	n, _ := new(big.Int).SetString(numstr, 10)
	m := new(big.Int)
	m.SetInt64(num)
	m.Add(n, m)
	return m.String()
}

func BigIntReduce(numstr string, num int64) string {
	n, _ := new(big.Int).SetString(numstr, 10)
	m := new(big.Int)
	m.SetInt64(-num)
	m.Add(n, m)
	return m.String()
}

 

来源：oschina

链接：https://my.oschina.net/qiongtaoli/blog/3154110