Type conversion and casting in C Sharp (C#) - Mini Project: Build & Apply

Type conversion and casting

📖 Scenario: You are working on a simple program that handles different types of numbers. Sometimes you need to convert numbers from one type to another to make calculations or display results correctly.

🎯 Goal: Build a program that converts and casts numbers between int, double, and string types, demonstrating how to change data types safely and correctly.

📋 What You'll Learn

Create an integer variable with a specific value

Create a double variable with a specific value

Convert the integer to a double using casting

Convert the double to an integer using casting

Convert the integer to a string using type conversion

Print all converted values to show the results

💡 Why This Matters

🌍 Real World

Type conversion and casting are common when working with user input, calculations, and displaying data in different formats.

💼 Career

Understanding how to convert and cast types is essential for software developers to avoid errors and write clear, correct code.

1

Create initial number variables

Create an int variable called myInt and set it to 42. Create a double variable called myDouble and set it to 3.14.

C Sharp (C#)

// Create an int variable called myInt and set it to 42
// Create a double variable called myDouble and set it to 3.14
// Your code here

Need a hint?

Use int myInt = 42; and double myDouble = 3.14; to create the variables.

2

Add variables for casting and conversion

Create a double variable called castedDouble and set it by casting myInt to double. Create an int variable called castedInt and set it by casting myDouble to int.

C Sharp (C#)

int myInt = 42;
double myDouble = 3.14;
// Create a double variable castedDouble by casting myInt to double
// Create an int variable castedInt by casting myDouble to int
// Your code here

Need a hint?

Use (double)myInt to cast int to double and (int)myDouble to cast double to int.

3

Convert integer to string

Create a string variable called intAsString and set it by converting myInt to a string using the ToString() method.

C Sharp (C#)

int myInt = 42;
double myDouble = 3.14;
double castedDouble = (double)myInt;
int castedInt = (int)myDouble;
// Convert myInt to string and store in intAsString
// Your code here

Need a hint?

Use myInt.ToString() to convert the integer to a string.

4

Print all converted values

Print the values of castedDouble, castedInt, and intAsString each on a new line using Console.WriteLine().

C Sharp (C#)

int myInt = 42;
double myDouble = 3.14;
double castedDouble = (double)myInt;
int castedInt = (int)myDouble;
string intAsString = myInt.ToString();
// Print castedDouble
// Print castedInt
// Print intAsString
// Your code here

Need a hint?

Use Console.WriteLine() to print each variable on its own line.