//
// example of recursion:
//
// 	function to compute integer to non-negative power
//
// main (test) program repeatedly prompts for inputs
//
#include <iostream.h>

// precondition:  e >= 0
// postcondition:  returns b to the e power
int exponent(const int b, const int e);

// ---- main program ----

int main()
{
	int b, e;
	char prompt[] = "Enter two integers, the second non-negative, "
		"or ctrl-D to end:\n";
	cout << prompt;
	while (cin >> b >> e)
	{
		if (e < 0)
			cout << "Second number must be non-negative!\n";
		else
			cout << b << " to the " << e << "-th power = "
				<< exponent(b, e) << endl;
		cout << prompt;
	}
	return 0 ;
}

// ---- function definition ----

int exponent(const int b, const int e)
{
	if (e == 0)
		return 1;
	else
		return b * exponent(b, e-1);
}