How to convert int array to int?

Question

What I would like to learn how to do is to convert an int array to an int in C#.

However I want to append the int with the values from the array.

Example:

int[] array = {5, 6, 2, 4};

Would be converted into an int that equals 5624.

Thanks for any help in advance.

Answer 1

simply multiply each number with 10^ his place in the array.

int[] array = { 5, 6, 2, 4 };
int finalScore = 0;
for (int i = 0; i < array.Length; i++)
{
    finalScore += array[i] * Convert.ToInt32(Math.Pow(10, array.Length-i-1));
}

Answer 2

int output = array
    .Select((t, i) => t * Convert.ToInt32(Math.Pow(10, array.Length - i - 1)))
    .Sum();

Answer 3

Another simple way:

int[] array =  {5, 6, 2, 4};
int num;
if (Int32.TryParse(string.Join("", array), out num))
{
    //success - handle the number
}
else
{
    //failed - too many digits in the array
}

Trick here is making the array a string of digits then parsing it as integer.