static void Main(string[] args)
{
Console.WriteLine("Enter a no");
int no = int.Parse(Console.ReadLine());
BigInterger fact = 1;
if (no > 0)
{
for (int i = 1; i <= no; i++)
{
fact = fact * i;
}
Console.WriteLine("{0}!={1}", no, fact);
string str = fact.ToString();
string[] ss = str.Split('0');
int count = 0;
for (int i = ss.Length - 1; i >= 0; i--)
{
if (ss[i] == "")
count = count + 1;
else
break;
}
Console.WriteLine("No of trailing zeroes are = {0}", count);
}
else
{
Console.WriteLine("Can't calculate factorial of negative no");
}
Console.ReadKey();
}
static void Main(string[] args) {
string[] numbers = File.ReadAllLines("input.txt");
BigInteger[] nonstring = new BigInteger[numbers.Length];
//Creates a BigInterger array the same length of the string array.
//I am reading the numbers as strings because they are easy to manipulate.
for (int i = 0; i < numbers.Length; i++) {
nonstring[i] = new BigInteger(BigInteger.Parse(numbers[i]));
Console.WriteLine(numbers[i]);
}
BigInteger sum = new BigInterger(0);
for (int i = 0; i < nonstring.Length; i++) {
sum += nonstring[i];
Console.WriteLine(sum);
}
Console.WriteLine(sum);
Console.Read();
}
