练习13

#include <iostream>
using namespace std;


int getPower(int x, int y);
double getPower(double x, int y);


int main()
{
int iNumber, power;
double dNumber;
int iAnswer;
double dAnswer;
cout << "Enter an int base number: ";
cin >> iNumber;
cout << "Enter a double base number: ";
cin >> dNumber;
cout << "To what power? ";
cin >> power;
iAnswer = getPower(iNumber,power);
dAnswer = getPower(dNumber,power);
cout << iNumber << " to the " << power << "th power is " <<iAnswer << endl;
cout << dNumber << " to the " << power << "th power is " <<dAnswer << endl;
return 0;
}


int getPower(int x, int y)
{
    if(y == 1)
       return x;
    else if(y == 0)
       return 1;
    else if(y < 0)
       return 0;
    else
       return (x * getPower(x,y-1));
}


double getPower(double x, int y)
{
    if(y == 1)
       return x;
    else if(y == 0)
       return 1;
    else if(y < 0)
       return 1/ getPower(x,-y);
    else
       return (x * getPower(x,y-1));
}