Methods

Methods

Methods are reusable blocks of code. In C#, they can have parameters and return values:

static int Add(int a, int b) {
    return a + b;
}
Console.WriteLine(Add(3, 4)); // 7

Expression Body

Short methods can use => (arrow syntax):

static int Square(int n) => n * n;
static string Greet(string name) => $"Hello, {name}!";

Multiple Return Values with Tuples

static (int min, int max) MinMax(int[] arr) {
    return (arr.Min(), arr.Max());
}
var (lo, hi) = MinMax(new[] { 3, 1, 4, 1, 5 });
Console.WriteLine($"{lo} {hi}"); // 1 5

Your Task

Write a static method IsPrime(int n) that returns true if n is a prime number, false otherwise.