Written in C++; need help finalizing by program. The parts in bold is what I can

Question

Written in C++; need help finalizing by program. The parts in bold is what I can't seem to put together. I added my code below. Please help if you can :)

Write a function that uses recursion to raise a number to a power. The function should accept two arguments, the number to be raised and the exponent. Assume that the exponent is a nonnegative integer. Show that this function works correctly for several values.

#include<iostream>
using namespace std;

int power (int x, int n);

int main()
{

//declaration of variables
int base;
int exponent, pow;

cout<<"Enter a base value: ";
cin>>base;
cout<<"Enter an exponent value: ";
cin>>exponent;
cout<<base<<" raised to "<<exponent<<" is: "
   <<power(base,exponent)<<endl;
system("pause");
return 0;
}

// Functions for x and n
int power(int x, int n)
   {
    if(n ==0)
        return 1;
    else
        return x * power(x, n -1);
    }
//end

Explanation / Answer

#include <iostream.h>
long int power (int x, int n);

int main()
{

//declaration of variables
int base;
int exponent, pow;

cout<<"Enter a base value: ";
cin>>base;
cout<<"Enter an exponent value: ";
cin>>exponent;
cout<<base<<" raised to "<<exponent<<" is: "
   <<power(base,exponent)<<endl;
//system("pause");
return 0;
}

// Functions for x and n
long int power(int x, int n)
   {
    if(n ==0)
   return 1;
    else
   return x * power(x, n -1);
    }

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