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public class Functions
{
public static long Factorial(int n)
{
if (n < 0) { return -1; } //error result - undefined
if (n > 256) { return -2; } //error result - input is too big
if (n == 0) { return 1; }
// Calculate the factorial iteratively rather than recursively:
long tempResult = 1;
for (int i = 1; i <= n; i++)
{
tempResult *= i;
}
return tempResult;
}
}
class MainClass
{
static int Main(string[] args)
{
// Test if input arguments were supplied:
if (args.Length == 0)
{
System.Console.WriteLine("Please enter a numeric argument.");
System.Console.WriteLine("Usage: Factorial <num>");
return 1;
}
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