how to create a method that print out the max of 3 numbers

Try:

using System;

class Program

{

static void Main()

{

double[] numbers = new double[3];

Console.WriteLine("Please enter 3 numbers\n");

for(int i = 0; i < 3; i++)

{

while(true)

{

Console.Write("Number {0} : ", i + 1);

bool isValid = double.TryParse(Console.ReadLine(), out numbers[i]);

if (isValid) break;

Console.WriteLine("Not a valid number, please re-enter");

}

Console.WriteLine("\nThe maximum of these numbers is {0}", Max(numbers[0], numbers[1], numbers[2]));

Console.ReadKey();

}

static double Max(double number1, double number2, double number3)

{

return Math.Max(Math.Max(number1, number2), number3);

}