Slide 1

Array Creation

To declare an array in C#, you can use the following syntax −

 datatype[] arrayName;

where,

• datatype is used to specify the type of elements in the array.
• specifies the rank of the array. The rank specifies the size of the array.
• arrayName specifies the name of the array.

For example,

 double[] balance;

Slide 2

Initializing an Array

Declaring an array does not initialize the array in the memory. When the array variable is initialized, you can assign values to the array.

Array is a reference type, so you need to use the new keyword to create an instance of the array. For example,

 double[] balance = new double[10];

Slide 3

Assigning Values to an Array

You can assign values to individual array elements, by using the index number, like −

 double[] balance = new double[10];
 balance[0] = 4500.0;

You can assign values to the array at the time of declaration, as shown −

 double[] balance = { 2340.0, 4523.69, 3421.0};

You can also create and initialize an array, as shown −

 int [] marks = new int[5]  { 99,  98, 92, 97, 95};

Slide 4

You may also omit the size of the array, as shown −

 int [] marks = new int[]  { 99,  98, 92, 97, 95};

You can copy an array variable into another target array variable. In such case, both the target and source point to the same memory location −

 int [] marks = new int[]  { 99,  98, 92, 97, 95};
 int[] score = marks;

When you create an array, C# compiler implicitly initializes each array element to a default value depending on the array type. For example, for an int array all elements are initialized to 0.