Numbers

Part of the Fundamentals section of Coddy's C# journey — lesson 5 of 69.

Variables are containers that hold data values. They are used to store, manipulate, and display information within a program.

In short, a variable is like a memory unit that we can access by typing the name of the variable.

Each variable has a unique name and a value that can be of different types. C# has various built-in data types that define the type of value a variable can hold.

To initialize a variable, we use the following format:

variableType variableName = value;

In C#, numbers are typically represented using two main data types: int and double.

int is used to store whole numbers without any decimal point. For example:

int age = 30;
int temperature = -5;
int count = 100;

double is used to store numbers with a decimal point. For example:

double price = 99.99;
double pi = 3.14159;
double fraction = 0.5;

When declaring variables in C#, you need to specify the type of the variable before the variable name. This is known as type declaration. Once a variable is declared with a certain type, it can only hold values of that type.

Challenge

Beginner

Write a C# program that declares and initializes the following variables:

Declare an int variable named quantity and initialize it with the value 5.
Declare a double variable named itemPrice and initialize it with the value 24.99.

Don't forget the semicolon in the end of each line!

Try it yourself

using System;

public class Program {
    public static void Main(string[] args) {
        // Declare and initialize variables here
        
        
        // Don't change below
        Console.WriteLine("Quantity: " + quantity);
        Console.WriteLine("Price: " + itemPrice);
        
    }
}