Modify values of arrays and the foreach loop

In this article we will discuss how to change values ​​in an array. To do this, we have to overwrite the position we want to change with a different value than the one we have initialized. Let’s take a look at this.

Example: Change values ​​in array

class Program
{
 
        public static void Main(string[] args)
        {
            string[] animalsArray = { "Dog", "Cat", "Mouse", "Elephant" };
            Console.WriteLine("Before changing");
            Console.WriteLine(animalsArray[0]);
            Console.WriteLine(animalsArray[1]);
            animalsArray[0] = "Monkey";
            animalsArray[1] = "Horse";

            Console.WriteLine("After changing");
            Console.WriteLine(animalsArray[0]);
            Console.WriteLine(animalsArray[1]);
            
            Console.ReadLine();
        }
        
}

Here we created an Array os String in which we entered 4 animals. Then we print out the animals in our array. Afterwards we overwrite some of them and print out again.

As an output we receive:

Before changin

Dog

Cat

After changing

Monkey

Horse

Example for a Foreach Loop in CSharp

class Program
{
 
        public static void Main(string[] args)
        {
            string[] animalsArray = { "Dog", "Cat", "Mouse", "Elephant" };

            foreach (string index in animalsArray)
            {
                Console.WriteLine(index);
            }
            Console.WriteLine("Overwriting values ------");
            animalsArray[0] = "Bug";
            animalsArray[2] = "Lion";

            foreach (string index in animalsArray)
            {
                Console.WriteLine(index);
            }
            Console.ReadLine();
        }
        
}

Now we can do it much more automated. We use a foreach loop. It allows us to run through the whole array and work with the values aftewards.

The syntax is the following

foreach (Data type Variablename in Arrayname)

{
// what to do with the elements in the array
}