Arrays

Arrays

Arrays store a fixed-size sequence of elements of the same type:

int[] numbers = { 4, 2, 7, 1, 9 };
Console.WriteLine(numbers[0]);  // 4 (zero-indexed)
Console.WriteLine(numbers.Length); // 5

Sorting and Searching

int[] nums = { 3, 1, 4, 1, 5, 9 };
Array.Sort(nums);
// nums is now { 1, 1, 3, 4, 5, 9 }

Iterating

foreach (int n in numbers) {
    Console.WriteLine(n);
}

Your Task

Write a static method Sum(int[] arr) that returns the sum of all elements.