Variables and string interpolation

7 min 20 XP + 10 for no hints

C# variables have types: string for text, int for whole numbers, bool for true or false.

String interpolation puts values into text. Start the string with $ and wrap names in braces: $"Age: {age}".

An if statement runs code only when a condition is true, like if (age >= 18).

Example (inside Main)

string city = "Oslo";
int temp = -3;
Console.WriteLine($"It is {temp} degrees in {city}");

Output

It is -3 degrees in Oslo

Without the $, C# prints the braces literally: Age: {age}.

Your tasks

0 of 3 done

Change name to your own name
Print the age with string interpolation, $"…{age}…"
Add an if that checks age >= 18

Quick check

What does Console.WriteLine($"Hi {name}") print when name is "Ada"?

Program.csChecked as you type

using System;

class Program
{
    static void Main()
    {
        string name = "Sam";
        int age = 21;
        Console.WriteLine("Name: " + name);
    }
}

No problems found. Unclosed tags, missing semicolons and errors show up here in plain words.

1using System;

3class Program

5 static void Main()

6 {

7 string name = "Sam";

8 int age = 21;

9 Console.WriteLine($"Name: {name}");

10 if (age >= 18)

11 {

12 Console.WriteLine("You can vote.");

13 }

14 }

15}

A string variable called name holds the text "Sam".

Variables

name

"Sam"

Output

Step 1 of 6

Variables and string interpolation

Your tasks

Tutor

Quick check

Variables

Output