CSHARP

gcd of list of number

// call this function
    public static int gcd(List<int> input) 
    {
        int result = input[0];
        for (int i = 1; i < input.Count; i++) 
        {
            result = gcd(result, input[i]);
        }
        return result;
    }
    
    private static int gcd(int a, int b) 
    {
        while (b > 0) 
        {
            int temp = b;
            b = a % b; // % is remainder
            a = temp;
        }
        return a;
    }