數值的整數次方

#include <iostream>
#include <math.h>
using namespace std;
bool equalzero(double a,double b)
{
    if((a-b<0.0000001)&&(a-b>-0.0000001))
        return true;
    else
        return  false;
}
double powerwithtwo(double base,int exp)
{
    double result = 1.0;
    for(int i=0;i<exp;i++)
        result *= base;
    return result;
}
double power(double base,int exp)
{
    if(equalzero(base,0.0))
        return 0;
    if(exp>0)
    {
        return powerwithtwo(base,exp);
    }
    if(exp==0)
        return 1;
    if(exp<0)
    {
        double result = powerwithtwo(base,-exp);
        return 1.0/result;
    }
}
int main()
{
    cout<<power(0,0)<<endl;
    cout<<pow(0,0)<<endl;
    return 0;
}

零的零次方無意義，得零也行 得一也行