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Declaring and Using Variables

In C#, a variable must be declared with a specific data type before it can be used. Once declared, it can store values of that type. The syntax for declaring a variable is: dataType variableName = value;.

Key Concepts

  • Variables in C# must be declared with a type.
  • The syntax follows dataType variableName = value;.
  • Common data types include int, string, and double.

Example of Declaring Variables

Code Example

// Declare variables of different data types
int age = 25;
string name = "John";
double salary = 5000.50;

// Output the values to the console
Console.WriteLine($"Name: {name}, Age: {age}, Salary: {salary}");

Output:

Name: John, Age: 25, Salary: 5000.50

Code Explanation: The variables age, name, and salary are declared with types int, string, and double, respectively. The Console.WriteLine() method is used to display their values using string interpolation.

Output Explanation: The values assigned to the variables are printed to the console: John, 25, and 5000.50.

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