Creating and Using Arrays

C# Tutorials - Herong's Tutorial Examples

∟Creating and Using Arrays - Example

This section provides a tutorial example on how to create and use an array.

The following program is a good illustration of the different array syntaxes:

// Arrays.cs
// Copyright (c) 2006 HerongYang.com. All Rights Reserved.

class Arrays {
   static void Main() {
      int[] primes;
      primes = new int[10];
      primes[0] = 2;
      primes[2] = 5;
      System.Console.WriteLine("The 3rd prime number is: {0}",
         primes[2]);
      double[] temperatures = new double[3];
      temperatures[0] = 70.0;
      temperatures[1] = 75.0;
      temperatures[2] = 73.5;
      System.Console.WriteLine("Forecast for tomorrow's high"
         + " temperature: {0}", temperatures[2]);
   }
}

Output:

The 3rd prime number is: 5
Forecast for tomorrow's high temperature: 73.5

Please note that:

The first element has an index of 0, not 1.
You don't have to assign values to all array elements. primes[1] has no value in the above program.
You will get an outside-the-bounds error, if you try to use primes[10], because you are trying to access the 11th position of the array, which doesn't exist.
We are allowed to join the assignment with the declaration statement, like "double[] temperatures = new double[3];".