Type Casting

Part of the Fundamentals section of Coddy's C# journey — lesson 14 of 69.

Type casting is the process of converting a value from one data type to another.

In C#, we can convert integers to doubles, doubles to integers, and more. There are two types of casting: implicit (automatic) and explicit (manual) casting.

For example Integer to Double:

Implicit (automatic) casting:

int number = 5;
double decimal_implicit = number; // automatically becomes 5.0

// with calculation
int x = 7;
double result_implicit = x / 2.0; // result is 3.5

Explicit (manual) Casting Double to Integer:

double decimal_explicit = 9.7;
int number_explicit = (int) decimal_explicit;  // becomes 9 (decimal part is truncated)

// with calculation
double price = 19.99;
int roundedPrice = (int) price;  // becomes 19

Challenge

Beginner

Write a C# program that demonstrates type casting. Perform the following operations:

Declare a double variable named price and initialize it with the value 99.99.
Cast the price variable to an int and store the result in a new variable named intPrice.
Print the values of price and intPrice to the console.

Cheat sheet

Type casting converts values from one data type to another. There are two types:

Implicit casting (automatic) - smaller to larger types:

int number = 5;
double decimal_implicit = number; // automatically becomes 5.0

Explicit casting (manual) - larger to smaller types:

double decimal_explicit = 9.7;
int number_explicit = (int) decimal_explicit;  // becomes 9 (truncated)

Try it yourself

using System;

public class Program {
    public static void Main(string[] args) {
        // Declare and initialize variables
        double price = 99.99;
        int intPrice = ?;
        
        
        // Output the values
        Console.WriteLine("Price: " + price);
        Console.WriteLine("Int Price: " + intPrice);
        
    }
}