Type casting in Java - Mini Project: Build & Apply

Type Casting in Java

📖 Scenario: You are working on a simple calculator program that needs to convert numbers between different types to perform calculations correctly.

🎯 Goal: Learn how to convert (cast) numbers from one type to another in Java and see the results.

📋 What You'll Learn

Create variables with specific types and values

Create a variable to hold a casted value

Use explicit type casting to convert a double to an int

Print the original and casted values

💡 Why This Matters

🌍 Real World

Type casting is used when you need to convert data from one type to another, such as when reading input, performing calculations, or working with different APIs.

💼 Career

Understanding type casting is essential for software developers to handle data correctly and avoid errors in programs.

1

Create a double variable

Create a variable called originalValue of type double and set it to 9.78.

Java

// Create a variable called originalValue of type double and set it to 9.78
// Your code here

Need a hint?

Use the syntax: double variableName = value;

2

Create an int variable for the casted value

Create a variable called castedValue of type int to hold the casted value.

Java

double originalValue = 9.78;
// Create an int variable called castedValue
// Your code here

Need a hint?

Declare an int variable without assigning a value yet.

3

Cast the double to int

Assign the value of originalValue casted to int to the variable castedValue using explicit type casting.

Java

double originalValue = 9.78;
int castedValue;
// Cast originalValue to int and assign to castedValue
// Your code here

Need a hint?

Use (int) originalValue to cast the double to int.

4

Print the original and casted values

Print the values of originalValue and castedValue using System.out.println with the exact text:
Original value: 9.78
Casted value: 9

Java

double originalValue = 9.78;
int castedValue;
castedValue = (int) originalValue;
// Print the originalValue and castedValue with the exact text
// Your code here

Need a hint?

Use System.out.println("Original value: " + originalValue); and similarly for castedValue.