一、写在前面
最近看到小伙伴遇到超大数 使用int64(longint) 无法运算 超出范围等错误，下面是math中的大数加减乘除运算希望对大家有帮助
二、超大数据计算
package main
import (
"fmt"
"math/big"
)
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()
}
func BigIntMul(numstr string, num int64)string{
n, _ := new(big.Int).SetString(numstr, 10)
m := new(big.Int)
m.SetInt64(num)
m.Mul(n, m)
return m.String()
}
func BigIntDiv(numstr string, num int64)string{
n, _ := new(big.Int).SetString(numstr, 10)
m := new(big.Int)
m.SetInt64(num)
m.Div(n, m)
return m.String()
}
func main(){
numstr := "1515631351536151161464461151511561"
//加
fmt.Println(BigIntAdd(numstr, 99))
//减
fmt.Println(BigIntReduce(numstr, 99))
//乘
fmt.Println(BigIntMul(numstr,99))
//除
fmt.Println(BigIntDiv(numstr,99))
}