C# Display Variables

Welcome to The Coding College, your trusted platform for learning programming concepts! In this tutorial, we will explore how to display variables in C#—a foundational concept for any programmer. You’ll learn how to output variable values using different techniques to make your programs more interactive.

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Why Display Variables?

Displaying variables is essential in programming to:

  • Debug your program by checking variable values.
  • Interact with users by showing meaningful outputs.
  • Track data changes during program execution.

Basic Output in C#

C# uses the Console.WriteLine() and Console.Write() methods to display variables or text in the console.

  • Console.WriteLine(): Outputs a line of text and moves to the next line.
  • Console.Write(): Outputs text without moving to a new line.

Example:

using System;

class Program
{
    static void Main()
    {
        int age = 24;
        string name = "The Coding College";

        Console.WriteLine("Name: " + name);
        Console.WriteLine("Age: " + age);
    }
}

Output:

Name: The Coding College  
Age: 24

Using String Interpolation

String interpolation is a modern and concise way to include variables in output. It uses the $ symbol before the string and curly braces {} to insert variable values.

Example:

using System;

class Program
{
    static void Main()
    {
        string name = "The Coding College";
        int year = 2024;

        Console.WriteLine($"Welcome to {name}, established in {year}!");
    }
}

Output:

Welcome to The Coding College, established in 2024!

Combining Strings and Variables

You can concatenate strings and variables using the + operator.

Example:

using System;

class Program
{
    static void Main()
    {
        string name = "C# Learner";
        int lessonsCompleted = 10;

        Console.WriteLine("Hello, " + name + "! You have completed " + lessonsCompleted + " lessons.");
    }
}

Output:

Hello, C# Learner! You have completed 10 lessons.

Displaying Multiple Variables

You can display multiple variables in a single Console.WriteLine() statement using placeholders ({}) and the string.Format() method.

Example with Placeholders:

using System;

class Program
{
    static void Main()
    {
        string name = "The Coding College";
        int year = 2024;
        double rating = 4.9;

        Console.WriteLine("Name: {0}, Year: {1}, Rating: {2}", name, year, rating);
    }
}

Output:

Name: The Coding College, Year: 2024, Rating: 4.9

Example Program

Here’s a complete program demonstrating various methods to display variables:

using System;

class Program
{
    static void Main()
    {
        // Declare variables
        string studentName = "John Doe";
        int age = 20;
        double gpa = 3.8;

        // Display variables using different methods
        Console.WriteLine("Using concatenation:");
        Console.WriteLine("Name: " + studentName + ", Age: " + age + ", GPA: " + gpa);

        Console.WriteLine("\nUsing placeholders:");
        Console.WriteLine("Name: {0}, Age: {1}, GPA: {2}", studentName, age, gpa);

        Console.WriteLine("\nUsing string interpolation:");
        Console.WriteLine($"Name: {studentName}, Age: {age}, GPA: {gpa}");
    }
}

Output:

Using concatenation:  
Name: John Doe, Age: 20, GPA: 3.8  

Using placeholders:  
Name: John Doe, Age: 20, GPA: 3.8  

Using string interpolation:  
Name: John Doe, Age: 20, GPA: 3.8

Best Practices for Displaying Variables

  1. Use String Interpolation: It’s modern, readable, and less error-prone.
  2. Organize Outputs: Use consistent formatting to make outputs more professional.
  3. Avoid Hardcoding: Store values in variables for better flexibility.

Real-World Use Case

Suppose you’re building an application for a coding school. You might display the name, number of courses completed, and ratings using variables.

using System;

class Program
{
    static void Main()
    {
        string schoolName = "The Coding College";
        int courses = 25;
        double rating = 4.8;

        Console.WriteLine($"Welcome to {schoolName}! We offer {courses} courses with an average rating of {rating}.");
    }
}

Output:

Welcome to The Coding College! We offer 25 courses with an average rating of 4.8.

Learn More at The Coding College

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Conclusion

Displaying variables is a crucial skill in C# programming. With methods like concatenation, placeholders, and string interpolation, you can create dynamic and interactive programs. Start practicing now and see how these techniques can elevate your coding!

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