Missing something obvious as always...

[xsesx]

My code won't run properly. The error says unresolved externals. Any advice?

#include <iostream>
#include <cstring>

using namespace std;

char again;

void reverse(char*);

int main()
{
	do
	{
		const int SIZE = 80;
		char input[SIZE];

		cout << "Enter a string: " << endl << endl;
		cin.getline(input, SIZE);

		cout << "The string displayed backwards is: ";
		reverse(input);
		cout << endl << endl;
		

		cout << "Do you want to run this program again? Y/N: ";
		cin >> again;

	} while (again == 'y' || again == 'Y');

	return 0;
}

void reverse(char *str)
{
	int last = strlen(str) - 1;

	for (int index = last; index >= 0; index--)
		cout << str[index];
	cout << endl << endl;
}

[Dy7SLyTq]

extern char again

[tcs]

@DTSCode: No, `again´ shouldn't be declared `extern´!

@xsesx: Please report the entire error string.