2.2 Variables

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Variables are containers for storing data values. Its value can be changed and used many times in the program.

The variable has type, name and value. When creating a variable, a place in memory is allocated for it where the value itself will be stored.

The syntax for declaring a variable:

type variable_name;

First we declare the type of the variable then the name, which must match the following conditions:

• variable name should not contain punctuation marks and spaces;
• variable name cannot be a C# keyword. We talked about it in C# keywords.
• variable name can have alphabets, digits and underscore.
• variable name can starts with underscore and alphabet symbols, but not with digits.

Example:

After defining the variable, you can assign some value:

❗Tip: variable names should correspond as closely as possible to what the variable stores.

It is important to remember that you can assign a value to variable that correspond to the variable type. If we declared a string, then we cannot a store number to it:

Let’s see how you can access variables:

Result:

Constants

The value of variables can be changed in any part of the program. But what if we want to declare a variable whose value will be immutable? Here we can use constants. The constant must be initialized when defining and once defined, the constant cannot be changed.

To declare a variable as a constant, you need to write the const keyword before the variable type:

Basically, constants are declared in uppercase, but this is nothing more than convention.

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