数值的整数次方

#include <iostream>
using namespace std;
double expo(double num,int n)
{
    if(n==0)
         return 1;
    if(n==1)
         return num;
     double result =  expo(num,n>>1);
     result*=result;
     if(n&0x1==1)
         result*=num;
     return result;
}
int main()
{
    int n,num;
    while(cin>>num)
    {
        cin>>n;
        cout<<expo(num,n)<<endl;
    }
    return 0;
}
链接：https://www.nowcoder.com/questionTerminal/1a834e5e3e1a4b7ba251417554e07c00
来源：牛客网

class Solution {
public:
    double Power(double base, int exponent) {
         
        if(exponent == 0) return 1;
        if(base == 0) return 0;
        if(exponent == 1) 
            return base;
        else if(exponent == -1)
            return 1/base;
        return Power(base,exponent/2) * Power(base,exponent/2) * Power(base,exponent%2);
    }
};